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Dispersion management of a nonlinear amplifying loop mirror-based erbium-doped fiber laser

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Abstract

We report an investigation of dispersion management of an all-polarization-maintaining Er-fiber oscillator mode-locked via a nonlinear amplification loop mirror in a figure-nine cavity configuration with two output ports. The performance of the laser was investigated within the net cavity dispersion ranging from −0.034 ps2 to +0.006 ps2. We show that the spectral and temporal phase of the pulses at both figure-nine outputs have clearly different characteristics. One of the laser outputs provides pulses with significantly better quality; nonetheless, the rejection output also offers ultrashort pulses with broad spectra. Pulses as short as 79 fs with an energy of 83 pJ were generated directly from the laser in the near-zero dispersion regime.

© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

1. Introduction

More than three decades of expansion in the field of ultrafast fiber lasers have yielded astonishing development transferred into applications in science [1], industry [2,3], and biomedicine [4,5]. Compact footprint and weight combined with the ability to provide robust and non-interventional operation distinguish fiber laser technology from bulk lasers. Numerous material-based saturable absorbers (SA) such as semiconductor saturable absorber mirrors (SESAM) [6], carbon nanotubes [7], graphene [8], topological insulators [9], transition metal dichalcogenides [10], and black phosphorous [11] have been demonstrated to support reliable and self-starting passive mode-locking. Nevertheless, the dependence of the absorber properties on its design is frequently constraining application to a specific region of the parameter space. A real saturable absorber requires the formulation of a method to introduce it into the laser cavity to achieve proper interaction with light. The demand to establish a reproducible method of manufacturing frequently requires applications of advanced techniques. Moreover, material-based absorbers have a rather low damage threshold in comparison to optical fibers and have an tendency to degrade over time. Therefore, no less attention has been given to the additive pulse mode-locking (APM) techniques, where the equivalent of the real SA is based on nonlinear effects inside of the laser cavity [12]. In comparison to real SA, such methods highlights their advantages such as ultrafast recovery time, higher damage threshold and the reduction of potential degradation over time [1317].

The APM techniques were introduced more than two decades ago but now experience a growing interest in the ultrafast laser community. They include nonlinear polarization rotation (NPR) [18], nonlinear optical loop mirror (NOLM) [19], nonlinear amplifying loop mirror (NALM) [20], and nonlinear absorbing loop mirror (NAbLM) [21]. The requirement of environmentally stable operation can be fulfilled by the use of all-polarization-maintaining (PM) fiber lasers. The NPR method can support all-PM configurations, but it demands additional waveguide design or advanced methods of optimization [22,23]. Both NOLM and NALM also can be made with the use of all-PM fibers and components, and are based on a coherent interference between counterpropagating pulses that introduce intensity-dependent loss. The roundtrip transmission of the mirror loop and interference conditions are given by the splitting ratio between both propagation directions. The resultant difference in nonlinear phase shift imitates a fast saturable absorber. In NOLM, the phase shift is an effect of asymmetry of the used coupler. An additional phase difference in NALM configuration is a result of the asymmetry of active fiber position. Self-starting mode-locking without additional non-reciprocal phase bias is achievable but requires high optical pumping to shift the transmission curve towards mode-locking supporting part of the slope [2428].

The phase biasing module can consist of a set of wave plates and one or more Faraday rotators [29,30]. In the so-called “figure of 9” (F9L) configuration, such a phase bias typically consists of two Faraday rotators [31], while setups involving a fiber loop and linear arm might use only one Faraday rotator in the linear part [32,33]. Alternatively, T. Jiang et al. presented an all-PM NALM-based system using reflective-type phase shifter located in the loop that incorporated a Wollaston prism, a Faraday rotator, an λ/8 waveplate, and a mirror [34]. A recent work by Liu et al. shows a comparison of self-starting threshold and the phase noise between fiber lasers using different phase bias in the linear arm, concluding that usage of λ/8 waveplate led to the lowest self-starting threshold and highest phase noise level comparing to λ/6 and λ/10 waveplates [35]. Kuse et al. reported an all-PM F9L-based stabilized optical frequency comb with phase bias in loop segment incorporating two Faraday rotators and a waveplate resulting in low-noise operation with 40 attoseconds of integrated timing jitter measured from 10 kHz to 10 MHz [31]. All-PM configurations with a reflection-type shifter, working at center wavelengths of 1030, 1565, and 2050 nm, was successfully commercialized by Menlo Systems GmbH under the trademark Figure-9. Authors reported 3 mW of output power, 3 dB optical spectrum width of 43 nm at a repetition rate of 250 MHz for the setup working at 1565 nm [32]. Placing the phase shifter in the linear part of the cavity reduces the price (only one Faraday rotator required instead of two) and enables easy repetition rate scaling of the resonator thanks to a very short free-space path. The recently demonstrated stable source of 50 fs pulses generated directly from NALM-based fiber oscillator with a pulse energy of 0.16 nJ at 85 MHz incorporated a 30:70 fiber coupler and an integrated non-reciprocal phase shifter [36]. 44.6 fs pulses from a 257 MHz and 104 mW of output power from mode-locked non-polarization-maintaining Er-doped fiber laser based on a biased NALM have been reported [37]. Recent publications describing NALM-based configurations incorporating a 3 × 3 fiber coupler as phase bias have proven the advantages of this type of solution and will certainly contribute to the growth of interest of this approach [38,39]. Another all-PM NALM-based laser with integrated non-reciprocal phase bias in the loop segment with over 1.1 mW output power and 477 fs pulses at the repetition rate of 121 MHz [40]. Experimental and numerical investigation of mode-locking regimes within wide net cavity dispersion of NALM-based all-PM erbium-doped fiber laser achieved 132 fs pulse with a spectral width of 46 nm in the stretched pulse mode-locking regime. Build-up process dynamics for soliton, stretched pulse, and dissipative soliton mode-locking regimes were investigated. Dispersion management provided information about the limits of the performance of the given mode-locking regime. However, no methods capable of retrieving the pulse phase were used to fully characterize the source and no noise characteristics were measured [41]. Dispersion management of NALM-based fiber laser utilizing a Yb-doped single-polarization large-mode-area photonic crystal fiber working at 1040 nm shown pulses as short as 68 fs (13 nJ) for near-zero dispersion region and 1.95 W (152 fs) of output power in dissipative soliton region, where additional spectral filtering was necessary [42]. A recent investigation of a flexible all-PM Yb-doped fiber laser with a reflect-type phase biasing in different dispersion-dependent regimes has shown the dependence of intensity noise and free-running linewidth of the carrier-envelope-offset (CEO) on the net cavity dispersion. In combination with far from the spontaneous emission peak of Yb, close to zero net cavity dispersion leads to significant suppression of relative intensity noise (RIN) as well as narrowing of CEO linewidth and indicates the necessity of further investigation of dispersion regimes [43]. A LIDAR system based on two free-running all-PM NALM mode-locked fiber lasers with a ranging accuracy of ±2 µm within 65 m has been demonstrated. The advantage of the presented system was the use of one of the output ports for distance measurement (transmitted), while the reflective port was used for monitoring [44]. A novel simulational and experimental study on steady-state NALM fiber oscillator with both transmitted and reflected output ports has revealed a relationship between the transmission function and fluctuation of the intra-cavity pulse peak power that leads to amplitude-noise suppression in the transmitted output port [45]. Additionally, NALM has been shown as a mode-locker in various dual-wavelength mode-locked fiber lasers incorporating Sagnac loop filter [46], polarization multiplexing [47], and mechanical spectral filtering [33].

The most comprehensive study on the properties of figure-nine NALM laser so far, including mode-locking build-up dynamics, was performed by Nishizawa et al. [41]. However, none of the referred publications contained an extensive analysis of the spectral and temporal phase of the output pulses, obtained at both output ports as a function of the net cavity dispersion. Expanding knowledge resources in the field of this artificial saturable absorber grants permission to improved design solutions of given fiber laser to suit a particular application because the principle of operation of ultrafast optical switching is defined by the temporal characteristic of interfering portions of light. In this work, we report an investigation of dispersion management of all-PM NALM-based Er-fiber oscillator within the net cavity dispersion ranging from −0.034 ps2 to +0.006 ps2, which covers the three fundamental mode-locking regimes (soliton, stretched-pulse, and dissipative soliton). Our laser incorporates a reflection-type non-reciprocal phase shifter based on only one Faraday rotator, which reduces the number of components and simplifies the entire system in comparison to [2931,37,41,42,47,48]. Flexibility and ease in the selection of saturable absorber properties is a unique feature of the presented setup. We show that the pulses generated from both outputs of the figure-nine laser have different shapes of the spectral and temporal phase. One of the laser outputs provides pulses with a clearly better quality. Comprehensive spectral and temporal characterization, including phase analysis of the presented pulsed source, broadens the knowledge on the operation of ultrafast lasers using NALM as a saturable absorber.

2. Experimental setup

The structure of the oscillator consisting of a NALM segment and a linear arm is shown in Fig. 1. The fiber part includes 94.5 cm of polarization-maintaining (PM) erbium-doped fiber (Liekki Er80-4/125-HD-PM, PM EDF), PM single-mode fiber, and a PM wavelength division multiplexer. The gain fiber is placed asymmetrically in the loop, and it is pumped by a pigtailed single-mode laser diode operating at 980 nm (3SP Technologies, 1999CVB, LD). The pulses counterpropagating in the fiber loop are combined on a polarizing beamsplitter cube (Thorlabs PBS124, PBC1) and injected into the linear arm. The non-reciprocal phase shifter consisting of a Faraday rotator (Thorlabs I1550R5, FR) and a quarter-wave plate (Thorlabs WPQ05M-1550, QWP1) introduces phase bias between counter-circulating portions of light. A fast saturable absorber is imitated at PBC2 when coherent interference between counterpropagating pulses introduce intensity-dependent loss. The rejected part of the light is coupled out to the output 2 when the transmitted part passes through QWP2 and is reflected by the rear mirror (Thorlabs PF10-03-P01, M). The splitting ratio at output port 2 and modulation depth can be adjusted by fine-tuning the angle of QWP1, while the linear losses and splitting ratio at output port 1 can be adjusted by a change of QWP2 angle.

 figure: Fig. 1.

Fig. 1. Experimental setup. PM WDM: polarization-maintaining wavelength division multiplexer; PM EDF: polarization-maintaining erbium-doped fiber; PM SMF: polarization-maintaining single-mode fiber; LD: laser diode; col: collimator; PBC; polarization beam combiner; FR: Faraday rotator; QWP: quarter-wave plate; M: mirror.

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3. Results

We started our investigation of the laser performance with the PM SMF length of 290 cm, resulting in a net cavity dispersion of −0.034 ps2. Once the appropriate angular position of QWP1 and QWP2 was found, self-starting mode-locking could be achieved by increasing the pump power of LD to the level of 355 mW. Initially, the multi-soliton state was observed. Afterward, the single-pulse operation was obtained by decreasing the LD power to 128 mW. Output characteristics of each output port have been recorded via an optical spectrum analyzer (Yokogawa AQ6376, OSA), a 3.6 GHz RF spectrum analyzer (Agilent EXA N9010A, RF), an autocorrelator (APE pulseCheck, AC), and second harmonic frequency-resolved optical gating technique system (Mesa Photonics FS-Ultra2, FROG). The results are shown in Fig. 2. The full width at half maximum (FWHM) of the optical spectrum was 14 nm and 26 nm for output ports 1 and 2, respectively. Despite the solitonic character of pulses, the appearance of Kelly sidebands is limited what can be explained by the relatively low value of the net cavity dispersion and spectral filtering of NALM. The RF spectrum measurement indicated a repetition frequency of 51.55 MHz, with a signal to noise ratio (S/N) in the RF signal of over 65 dB Autocorrelation traces indicated pulse duration equal to 250 fs and 243 fs with an average output power of 3.5 mW and 5.0 mW for output ports 1 and 2, respectively. Reconstructed temporal intensities imply the occurrence of a slight temporal chirp of pulses at output port 2. In contrast, the temporal phase remains flat at output port 1 and indicates minor differences in pulse duration concerning autocorrelation measurements. Calculated trace-area-normalized FROG error was below 1% for both output ports.

 figure: Fig. 2.

Fig. 2. Measured output characteristics of both NALM output ports with net cavity dispersion equal to −0.034 ps2. (a) Optical spectra and spectral phases measured at both output ports. (b) Output port 1 RF spectrum (the resolution bandwidth of the measurement was 51 Hz); inset, RF spectrum measured in a 3.5 GHz span. (c) Autocorrelation traces of both output ports. (d) Reconstructed temporal intensity (black line), transform-limited intensity (dashed red line), and temporal phase of the pulse (dashed blue line) for both output ports. (e-f) Measured and retrieved FROG spectrograms at both output ports.

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3.1 Dispersion management of the laser

Once stable and repeatable self-starting laser operation was attained, we investigated the laser operation for different values of net cavity dispersions, realized by reduction of PM SMF length in the NALM, while angular positions of QWP1 and QWP2 has remained unchanged. Compared to other works [41,49,50], we were able to establish net cavity dispersion ranging from soliton regime to net-normal dispersion regime by only appropriate balance between active (normal dispersion) and passive (anomalous dispersion) fiber, without the need of adding additional dispersion compensation fiber segments. We only changed the length of the PM SMF, while the length EDF fiber was constant. Figure 3 shows the calculated net group velocity dispersion (GDD) and pulse repetition rate at various lengths of the PM SMF in the resonator. To determine the net GDD, we assumed the group velocity dispersion (GVD) as 28.0 ps2/km and −23.0 ps2/km at 1550 nm for active and passive fiber, respectively.

 figure: Fig. 3.

Fig. 3. Net cavity dispersion and repetition rate as a function of the PM SMF length.

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Optical spectra and corresponding autocorrelation traces directly from the oscillator are shown in Fig. 4 for output port 1, and in Fig. 5 for output port 2. Asymmetry in the position of active fiber leads to a situation where the pulse entering the fiber loop via collimator 2 is amplified to a high peak power and is broadened through self-phase modulation during propagation in a long segment of PM SMF. On the other hand, the pulse entering the loop via collimator 1 is amplified in the active fiber just before leaving the loop. Dudley et al. suggested that even for optimal ultrafast optical switching, the interference of two pulses with different duration may lead to a complex reflected pulse at the reflect port, which in our case is output port 2 [51]. Autocorrelation traces recorded for the net cavity dispersions of −0.019 ps2 and −0.012 ps2 have a sech2 shape typical for anomalous dispersion soliton regime, with minor Kelly’s sidebands [−0.019 ps2 and −0.012 ps2 of Fig. 4(a) and Fig. 5(a)]. The self-starting operation was achievable but required slightly higher pumping power in a range of 355 to 415 mW, while single pulse operation in this dispersion regime was occurring for pump powers close to 125 mW. Successive reduction of the passive fiber length led to a shift into stretched pulse regime, indicated by broadening of the optical spectra, decrement of pulse duration, and increase of output power at both output ports (−0.001 ps2 of Fig. 4 and Fig. 5). Once the near-zero dispersion regime occurs, the autocorrelation can be approximated by Gaussian shape. Pulses generated from both outputs had a duration below 100 fs, and the shortest pulse duration of 79 fs with an average power of 6.6 mW was achieved for net cavity dispersion −0.001 ps2 at output port 1. Self-starting in this region was achieved without multi-pulse operation. Instead of that, a single pulse with a continuous wave (CW) component appeared for the pump power around 530 mW. Further reduction of pump power was eliminating this feature. Stable, single pulse operation in near-zero dispersion for a pumping power of 180 mW and a repetition frequency of 80.12 MHz has reached pulses as short as 79 fs and 84 fs for output 1 and output 2, respectively [−0.001 ps2 of Fig. 4(b) and Fig. 5(b)]. The time-bandwidth products (TBP) were equal to 0.605 and 0.717 at output ports 1 and 2, respectively. In the net-normal dispersion regime, we observed further spectral broadening while the autocorrelation traces indicated slightly extended pulses durations. Pumping power as high as 555 mW was needed to obtain self-starting operation with CW component, while single pulse operation was reachable for over 240 mW [+0.001 ps2 and +0.003 ps2 of Fig. 4(a) and Fig. 5(a)]. No additional spectral filtering was necessary to observe dissipative solitons. A possible explanation of this feature is the spectral limitation resulting from the active fiber gain bandwidth, also assumed by Nishizawa et al. in their numerical investigation of pulse dynamics in this dispersion region [41]. When moving further towards the net-normal dispersion regime, the spectral width has narrowed, and the temporal width was increased to above 500 fs for both output ports [+0.006 ps2 of Fig. 4(b) and Fig. 5(b)]. Rectangle-like spectra in this regime are typical for dissipative soliton operation [52]. The self-starting operation with CW component occurred for pumping over 530 mW, and decreasing it to the level of 450 mW was sufficient to access single pulse operation. For the net cavity dispersion equal +0.006 ps2, we obtained the highest values of average output power equal to 16 mW and 37 mW for output 1 and 2, respectively.

 figure: Fig. 4.

Fig. 4. Optical spectra (a) and corresponding autocorrelation traces of the pulses (b) generated on output port 1 as a function of the net cavity dispersion.

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 figure: Fig. 5.

Fig. 5. Optical spectra (a) and corresponding autocorrelation traces of the pulses (b) generated on output port 2 as a function of the net cavity dispersion.

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3.2 Temporal and spectral analysis

The results of detailed spectral and temporal phase analysis of both outputs at different net dispersions are shown in Figs. 6 (output 1) and 7 (output 2). The transform-limited pulse profiles are calculated based on the Fourier transformation of the full retrieved electric field. The FROG-derived electric fields measured for the solitonic and near-zero regimes indicated pulses with flat, both spectral and temporal phase at output 1. This confirms the results obtained by the autocorrelation measurement, thus ensuring the appropriate utility of the presented configuration to the generation of a stable train of ultrashort pulses. Once the net dispersion takes a positive value, the spectral phase indicates a spectral chirp, and the spectrum is red-shifted. Still, with further shortening of the cavity, it shifts towards shorter wavelengths. Considering the dissipative soliton-like character of the pulses for the net cavity dispersion equal to +0.006 ps2, the measured spectral and temporal phase indicates rather usual chirp under the absence of sufficiently large anomalous dispersion [52]. Despite the increase in FWHM value, the temporal duration is increasing, confirming the deviation from the TBP limit in this regime.

 figure: Fig. 6.

Fig. 6. Characteristics of the output port 1: (a) optical spectra measured by the OSA (solid black line) and the FROG (red solid line) with retrieved spectral phase (dashed blue line). (b) Reconstructed temporal intensity (solid black line), transform-limited intensity (dotted red line), and temporal phase (dashed blue line).

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We observed a slight discrepancy between the FWHM pulse duration measurement using the autocorrelator and FROG especially at normal dispersion, when the pulse shapes start to be more complex. In this case, a more robust information is given by the FROG, due to limitations of the autocorrelation technique itself, which is not capable of retrieving complex pulse shapes [53].

FROG measurement for output port 2 is shown in Fig. 7. FROG-derived electric fields measured for the solitonic regime indicate slightly chirped pulses. Gain asymmetry of the NALM segment manifests in differences in temporal shapes of counterpropagating pulses affecting the shape of pulses at the rejection port [51]. Since both of the counterpropagating pulses are not temporally compressed at the entrance of the active fiber, the different spectral components will experience wavelength-dependent nonlinear phase shift. Therefore, the polarization state at the output of PBC1 is wavelength-dependent and will determine the splitting ratio at output port 2. Spectral deformation at the output port 2 in comparison to the output port 1 is a result of this wavelength-dependent output coupling at the PBC1. Interestingly, in the near-zero dispersion region, no spectral chirp or distortion is observed.

 figure: Fig. 7.

Fig. 7. Characteristics of the output port 2: (a) Optical spectra measured by the OSA (solid black line) and the FROG (red solid line) with retrieved spectral phase (dashed blue line). (b) Reconstructed temporal intensity (solid black line), transform-limited intensity (dotted red line), and temporal phase (dashed blue line).

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To further investigate the behavior of the laser and explain the pulse propagation, we plotted a dispersion map of the resonator (Fig. 8) for pulse propagation in both directions: clockwise (a), and counterclockwise (b). The blue regions represent the passive PM SMF with anomalous dispersion, while the green regions – the EDF with normal dispersion. We assume that the dispersion of the PM WDM coupler is the same as the PM SMF. Additionally, we neglect the dispersion of the free-space components, since their contribution to the net GDD is insignificant. The light blue region represents the part of the PM SMF fiber in the cavity which was consecutively shortened to manage the cavity dispersion. The map explains the presence of a nearly-transform-limited pulse at the laser output in the near-zero dispersion regime (−0.001 ps2). In such regime, the pulses are usually positively chirped and require compression in a standard single-mode fiber or grating/prism compressor [28,36,40,52]. As can be seen in Fig. 8, the EDF is placed between two segments of PM SMF. The PM SMF placed after the EDF ideally compresses the positively chirped pulse, resulting in a nearly-transform-limited output without the need of further compression outside the cavity. A similar behavior of a figure-nine laser was observed by a Nishizawa et al. [41].

 figure: Fig. 8.

Fig. 8. Dispersion map of the resonator for propagation in (a) clockwise; (b) counterclockwise direction.

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Figure 9 summarizes the pulse spectral widths, durations, and energies as the function of the net dispersion of the cavity, recorded at both outputs. Anomalous dispersion region limits pulse width and energy what can be explained by the soliton area theorem. The maximum average power is here limited by the single-pulse operation limit. The decrease in pulse duration and increment of pulse energy can be observed in the near-zero dispersion regime, where the stretched-pulse mechanism leads to periodical stretching and recompressing allows for the accumulation of energy in the pulse. Dissipative soliton operation in a positive net dispersion region contributes to the increase of TBP and further growth of the pulse energy. Both outputs show the capacity to utilize them in spite of their slightly different output characteristics. Notably, output port 2 reached the output power of 37 mW (over 400 pJ of energy per pulse) for pulse duration of 564 fs.

 figure: Fig. 9.

Fig. 9. Pulse duration, pulse energy, and spectral width (FWHM) as a function of net cavity dispersion for (a) output port 1; (b) output port 2.

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4. Summary and conclusions

Summarizing, we have demonstrated an investigation of dispersion management of all-PM NALM-based Er-fiber oscillator within the net cavity dispersion ranging from −0.034 ps2 to +0.006 ps2. Pulses short as 79 fs generated directly from the laser with a pulse energy of 83 pJ for near-zero dispersion regime. Dispersion management is an enabling method in the way of optimization of laser operation for further applications. Output characteristics of both ports differ in terms of pulse duration, energy, and spectral bandwidth, but, also in terms of phase. We presented the first, to our best knowledge, demonstration of retrieved spectral and temporal phases of the pulses obtained at two outputs of a NALM-based ultrafast fiber laser. One of the laser outputs provides pulses with significantly better quality (i.e., flat spectral phase), especially in the anomalous dispersion regime. Nevertheless, we have experimentally shown that at near-zero net cavity dispersion both outputs are capable of delivering unchirped, sub-80 fs pulses.

Funding

Fundacja na rzecz Nauki Polskiej (First TEAM/2017-4/39).

Disclosures

The authors declare no conflicts of interest.

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26. S. Smirnov, S. Kobtsev, A. Ivanenko, A. Kokhanovskiy, A. Kemmer, and M. Gervaziev, “Layout of NALM fiber laser with adjustable peak power of generated pulses,” Opt. Lett. 42(9), 1732–1735 (2017). [CrossRef]  

27. J. Sun, Y. Zhou, Z. Ge, J. Yin, F. Yin, J. Dai, T. Zhang, and K. Xu, “Low-repetition-rate, high pulse energy all-polarization-maintaining Er-doped fiber laser mode-locked with a nonlinear amplifying loop mirror,” Laser Phys. Lett. 16(4), 045104 (2019). [CrossRef]  

28. J. Sun, Y. Zhou, Y. Dai, J. Li, F. Yin, J. Dai, and K. Xu, “All-fiber polarization-maintaining erbium-doped dispersion-managed fiber laser based on a nonlinear amplifying loop mirror,” Appl. Opt. 57(6), 1492–1496 (2018). [CrossRef]  

29. H. Lin, D. K. Donald, and W. V. Sorin, “Optimizing polarization states in a figure-8 laser using a nonreciprocal phase shifter,” J. Lightwave Technol. 12(7), 1121–1128 (1994). [CrossRef]  

30. H. Yoshimi, K. Sumimura, and Y. Ozeki, “An Er fiber laser generating multi-milliwatt picosecond pulses with ultralow intensity noise,” Jpn. J. Appl. Phys. 57(10), 108001 (2018). [CrossRef]  

31. N. Kuse, J. Jiang, C.-C. Lee, T. R. Schibli, and M. E. Fermann, “All polarization-maintaining Er fiber-based optical frequency combs with nonlinear amplifying loop mirror,” Opt. Express 24(3), 3095–3102 (2016). [CrossRef]  

32. W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017). [CrossRef]  

33. J. Fellinger, A. S. Mayer, G. Winkler, W. Grosinger, G.-W. Truong, S. Droste, C. Li, C. M. Heyl, I. Hartl, and O. H. Heckl, “Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser,” Opt. Express 27(20), 28062–28074 (2019). [CrossRef]  

34. T. Jiang, Y. Cui, P. Lu, C. Li, A. Wang, and Z. Zhang, “All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror,” IEEE Photonics Technol. Lett. 28(16), 1786–1789 (2016). [CrossRef]  

35. X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020). [CrossRef]  

36. J. Zhou, W. Pan, X. Fu, L. Zhang, and Y. Feng, “Environmentally-stable 50-fs pulse generation directly from an Er:fiber oscillator,” Opt. Fiber Technol. 52, 101963 (2019). [CrossRef]  

37. W. G. Wanli Gao, G. L. Guanyu Liu, and Z. Z. Zhigang Zhang, “44.6 fs pulses from a 257 MHz Er:fiber laser mode-locked by biased NALM,” Chin. Opt. Lett. 16(11), 111401 (2018). [CrossRef]  

38. D. Kim, D. Kwon, B. Lee, and J. Kim, “Polarization-maintaining nonlinear-amplifying-loop-mirror mode-locked fiber laser based on a 3 × 3 coupler,” Opt. Lett. 44(5), 1068–1071 (2019). [CrossRef]  

39. S. Boivinet, S. Vidal, and J. Boullet, “178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 × 3 coupler at 1 µm,” Laser Phys. Lett. 17(5), 055102 (2020). [CrossRef]  

40. K. Yin, Y.-M. Li, Y.-B. Wang, X. Zheng, and T. Jiang, “Self-starting all-fiber PM Er:laser mode locked by a biased nonlinear amplifying loop mirror,” Chin. Phys. B 28(12), 124203 (2019). [CrossRef]  

41. N. Nishizawa, H. Suga, and M. Yamanaka, “Investigation of dispersion-managed, polarization-maintaining Er-doped figure-nine ultrashort-pulse fiber laser,” Opt. Express 27(14), 19218–19232 (2019). [CrossRef]  

42. W. Liu, H. Shi, J. Cui, C. Xie, Y. Song, C. Wang, and M. Hu, “Single-polarization large-mode-area fiber laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Lett. 43(12), 2848–2851 (2018). [CrossRef]  

43. A. S. Mayer, W. Grosinger, J. Fellinger, G. Winkler, L. W. Perner, S. Droste, S. H. Salman, C. Li, C. M. Heyl, and O. H. Heckl, “Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties,” Opt. Express 28(13), 18946–18968 (2020). [CrossRef]  

44. Y. Li, Y. Cai, R. Li, H. Shi, H. Tian, M. He, Y. Song, and M. Hu, “Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers,” Chin. Opt. Lett. 17(9), 091202 (2019). [CrossRef]  

45. M. Edelmann, Y. Hua, K. Şafak, and F. X. Kärtner, “Intrinsic Amplitude-Noise Suppression in Fiber Lasers Mode-locked with Nonlinear Amplifying Loop Mirrors,” ArXiv201013824 Phys. (2020).

46. R. Li, H. Shi, H. Tian, Y. Li, B. Liu, Y. Song, and M. Hu, “All-polarization-maintaining dual-wavelength mode-locked fiber laser based on Sagnac loop filter,” Opt. Express 26(22), 28302–28311 (2018). [CrossRef]  

47. Y. Nakajima, Y. Hata, and K. Minoshima, “All-polarization-maintaining, polarization-multiplexed, dual-comb fiber laser with a nonlinear amplifying loop mirror,” Opt. Express 27(10), 14648–14656 (2019). [CrossRef]  

48. G. Liu, A. Wang, and Z. Zhang, “84-fs 500-MHz Yb:Fiber-Based Laser Oscillator Mode Locked by Biased NALM,” IEEE Photonics Technol. Lett. 29(23), 2055–2058 (2017). [CrossRef]  

49. Y. Zhou, Y. Zeng, J. Yin, T. Dong, L. Sun, Y. Zhang, and K. Xu, “All-polarization-maintaining figure-of-9 soliton and dispersion-managed Er-doped fiber oscillators,” Laser Phys. 30(4), 045101 (2020). [CrossRef]  

50. R. Liao, Y. Song, L. Chai, and M. Hu, “Pulse dynamics manipulation by the phase bias in a nonlinear fiber amplifying loop mirror,” Opt. Express 27(10), 14705–14715 (2019). [CrossRef]  

51. J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999). [CrossRef]  

52. R. I. Woodward, “Dispersion engineering of mode-locked fibre lasers,” J. Opt. 20(3), 033002 (2018). [CrossRef]  

53. R. Trebino, Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses (Springer US, 2000).

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    [Crossref]
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    [Crossref]
  43. A. S. Mayer, W. Grosinger, J. Fellinger, G. Winkler, L. W. Perner, S. Droste, S. H. Salman, C. Li, C. M. Heyl, and O. H. Heckl, “Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties,” Opt. Express 28(13), 18946–18968 (2020).
    [Crossref]
  44. Y. Li, Y. Cai, R. Li, H. Shi, H. Tian, M. He, Y. Song, and M. Hu, “Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers,” Chin. Opt. Lett. 17(9), 091202 (2019).
    [Crossref]
  45. M. Edelmann, Y. Hua, K. Şafak, and F. X. Kärtner, “Intrinsic Amplitude-Noise Suppression in Fiber Lasers Mode-locked with Nonlinear Amplifying Loop Mirrors,” ArXiv201013824 Phys. (2020).
  46. R. Li, H. Shi, H. Tian, Y. Li, B. Liu, Y. Song, and M. Hu, “All-polarization-maintaining dual-wavelength mode-locked fiber laser based on Sagnac loop filter,” Opt. Express 26(22), 28302–28311 (2018).
    [Crossref]
  47. Y. Nakajima, Y. Hata, and K. Minoshima, “All-polarization-maintaining, polarization-multiplexed, dual-comb fiber laser with a nonlinear amplifying loop mirror,” Opt. Express 27(10), 14648–14656 (2019).
    [Crossref]
  48. G. Liu, A. Wang, and Z. Zhang, “84-fs 500-MHz Yb:Fiber-Based Laser Oscillator Mode Locked by Biased NALM,” IEEE Photonics Technol. Lett. 29(23), 2055–2058 (2017).
    [Crossref]
  49. Y. Zhou, Y. Zeng, J. Yin, T. Dong, L. Sun, Y. Zhang, and K. Xu, “All-polarization-maintaining figure-of-9 soliton and dispersion-managed Er-doped fiber oscillators,” Laser Phys. 30(4), 045101 (2020).
    [Crossref]
  50. R. Liao, Y. Song, L. Chai, and M. Hu, “Pulse dynamics manipulation by the phase bias in a nonlinear fiber amplifying loop mirror,” Opt. Express 27(10), 14705–14715 (2019).
    [Crossref]
  51. J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
    [Crossref]
  52. R. I. Woodward, “Dispersion engineering of mode-locked fibre lasers,” J. Opt. 20(3), 033002 (2018).
    [Crossref]
  53. R. Trebino, Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses (Springer US, 2000).

2020 (6)

D. C. Kirsch, S. Chen, R. Sidharthan, Y. Chen, S. Yoo, and M. Chernysheva, “Short-wave IR ultrafast fiber laser systems: Current challenges and prospective applications,” J. Appl. Phys. 128(18), 180906 (2020).
[Crossref]

J. Zhao, J. Zhou, Y. Jiang, L. Li, D. Shen, A. Komarov, L. Su, D. Tang, M. Klimczak, and L. Zhao, “Nonlinear Absorbing-Loop Mirror in a Holmium-Doped Fiber Laser,” J. Lightwave Technol. 38(21), 6069–6075 (2020).
[Crossref]

X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020).
[Crossref]

S. Boivinet, S. Vidal, and J. Boullet, “178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 × 3 coupler at 1 µm,” Laser Phys. Lett. 17(5), 055102 (2020).
[Crossref]

A. S. Mayer, W. Grosinger, J. Fellinger, G. Winkler, L. W. Perner, S. Droste, S. H. Salman, C. Li, C. M. Heyl, and O. H. Heckl, “Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties,” Opt. Express 28(13), 18946–18968 (2020).
[Crossref]

Y. Zhou, Y. Zeng, J. Yin, T. Dong, L. Sun, Y. Zhang, and K. Xu, “All-polarization-maintaining figure-of-9 soliton and dispersion-managed Er-doped fiber oscillators,” Laser Phys. 30(4), 045101 (2020).
[Crossref]

2019 (9)

R. Liao, Y. Song, L. Chai, and M. Hu, “Pulse dynamics manipulation by the phase bias in a nonlinear fiber amplifying loop mirror,” Opt. Express 27(10), 14705–14715 (2019).
[Crossref]

Y. Li, Y. Cai, R. Li, H. Shi, H. Tian, M. He, Y. Song, and M. Hu, “Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers,” Chin. Opt. Lett. 17(9), 091202 (2019).
[Crossref]

Y. Nakajima, Y. Hata, and K. Minoshima, “All-polarization-maintaining, polarization-multiplexed, dual-comb fiber laser with a nonlinear amplifying loop mirror,” Opt. Express 27(10), 14648–14656 (2019).
[Crossref]

K. Yin, Y.-M. Li, Y.-B. Wang, X. Zheng, and T. Jiang, “Self-starting all-fiber PM Er:laser mode locked by a biased nonlinear amplifying loop mirror,” Chin. Phys. B 28(12), 124203 (2019).
[Crossref]

N. Nishizawa, H. Suga, and M. Yamanaka, “Investigation of dispersion-managed, polarization-maintaining Er-doped figure-nine ultrashort-pulse fiber laser,” Opt. Express 27(14), 19218–19232 (2019).
[Crossref]

J. Zhou, W. Pan, X. Fu, L. Zhang, and Y. Feng, “Environmentally-stable 50-fs pulse generation directly from an Er:fiber oscillator,” Opt. Fiber Technol. 52, 101963 (2019).
[Crossref]

D. Kim, D. Kwon, B. Lee, and J. Kim, “Polarization-maintaining nonlinear-amplifying-loop-mirror mode-locked fiber laser based on a 3 × 3 coupler,” Opt. Lett. 44(5), 1068–1071 (2019).
[Crossref]

J. Fellinger, A. S. Mayer, G. Winkler, W. Grosinger, G.-W. Truong, S. Droste, C. Li, C. M. Heyl, I. Hartl, and O. H. Heckl, “Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser,” Opt. Express 27(20), 28062–28074 (2019).
[Crossref]

J. Sun, Y. Zhou, Z. Ge, J. Yin, F. Yin, J. Dai, T. Zhang, and K. Xu, “Low-repetition-rate, high pulse energy all-polarization-maintaining Er-doped fiber laser mode-locked with a nonlinear amplifying loop mirror,” Laser Phys. Lett. 16(4), 045104 (2019).
[Crossref]

2018 (9)

J. Sun, Y. Zhou, Y. Dai, J. Li, F. Yin, J. Dai, and K. Xu, “All-fiber polarization-maintaining erbium-doped dispersion-managed fiber laser based on a nonlinear amplifying loop mirror,” Appl. Opt. 57(6), 1492–1496 (2018).
[Crossref]

P. Bowen, M. Erkintalo, and N. G. R. Broderick, “Large net-normal dispersion Er-doped fibre laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Commun. 410, 447–451 (2018).
[Crossref]

S. Ou, G. Liu, L. Guo, Z. Zhang, and Q. Zhang, “870 fs, 448 kHz pulses from an all-polarization-maintaining Yb-doped fiber laser with a nonlinear amplifying loop mirror,” Appl. Opt. 57(18), 5068–5071 (2018).
[Crossref]

H. Yoshimi, K. Sumimura, and Y. Ozeki, “An Er fiber laser generating multi-milliwatt picosecond pulses with ultralow intensity noise,” Jpn. J. Appl. Phys. 57(10), 108001 (2018).
[Crossref]

W. G. Wanli Gao, G. L. Guanyu Liu, and Z. Z. Zhigang Zhang, “44.6 fs pulses from a 257 MHz Er:fiber laser mode-locked by biased NALM,” Chin. Opt. Lett. 16(11), 111401 (2018).
[Crossref]

K. Wu, B. Chen, X. Zhang, S. Zhang, C. Guo, C. Li, P. Xiao, J. Wang, L. Zhou, W. Zou, and J. Chen, “High-performance mode-locked and Q-switched fiber lasers based on novel 2D materials of topological insulators, transition metal dichalcogenides and black phosphorus: review and perspective (invited),” Opt. Commun. 406, 214–229 (2018).
[Crossref]

W. Liu, H. Shi, J. Cui, C. Xie, Y. Song, C. Wang, and M. Hu, “Single-polarization large-mode-area fiber laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Lett. 43(12), 2848–2851 (2018).
[Crossref]

R. Li, H. Shi, H. Tian, Y. Li, B. Liu, Y. Song, and M. Hu, “All-polarization-maintaining dual-wavelength mode-locked fiber laser based on Sagnac loop filter,” Opt. Express 26(22), 28302–28311 (2018).
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R. I. Woodward, “Dispersion engineering of mode-locked fibre lasers,” J. Opt. 20(3), 033002 (2018).
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2017 (4)

G. Liu, A. Wang, and Z. Zhang, “84-fs 500-MHz Yb:Fiber-Based Laser Oscillator Mode Locked by Biased NALM,” IEEE Photonics Technol. Lett. 29(23), 2055–2058 (2017).
[Crossref]

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

S. Smirnov, S. Kobtsev, A. Ivanenko, A. Kokhanovskiy, A. Kemmer, and M. Gervaziev, “Layout of NALM fiber laser with adjustable peak power of generated pulses,” Opt. Lett. 42(9), 1732–1735 (2017).
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J. Szczepanek, T. M. Kardaś, C. Radzewicz, and Y. Stepanenko, “Ultrafast laser mode-locked using nonlinear polarization evolution in polarization maintaining fibers,” Opt. Lett. 42(3), 575–578 (2017).
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2016 (3)

2015 (1)

2014 (3)

R. Khazaeizhad, S. H. Kassani, H. Jeong, D.-I. Yeom, and K. Oh, “Mode-locking of Er-doped fiber laser using a multilayer MoS2 thin film as a saturable absorber in both anomalous and normal dispersion regimes,” Opt. Express 22(19), 23732–23742 (2014).
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K. Viskontas, K. Regelskis, and N. Rusteika, “Slow and fast optical degradation of the SESAM for fiber laser mode-locking at 1 µm,” Lith. J. Phys. 54(3), 127–135 (2014).
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N. Nishizawa, “Ultrashort pulse fiber lasers and their applications,” Jpn. J. Appl. Phys. 53(9), 090101 (2014).
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2013 (2)

M. E. Fermann and I. Hartl, “Ultrafast fibre lasers,” Nat. Photonics 7(11), 868–874 (2013).
[Crossref]

C. Xu and F. W. Wise, “Recent advances in fibre lasers for nonlinear microscopy,” Nat. Photonics 7(11), 875–882 (2013).
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2012 (4)

S. Y. Choi, D. K. Cho, Y.-W. Song, K. Oh, K. Kim, F. Rotermund, and D.-I. Yeom, “Graphene-filled hollow optical fiber saturable absorber for efficient soliton fiber laser mode-locking,” Opt. Express 20(5), 5652–5657 (2012).
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C. Zhao, H. Zhang, X. Qi, Y. Chen, Z. Wang, S. Wen, and D. Tang, “Ultra-short pulse generation by a topological insulator based saturable absorber,” Appl. Phys. Lett. 101(21), 211106 (2012).
[Crossref]

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2µm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

S. Y. Ryu, K.-S. Kim, J. Kim, and S. Kim, “Degradation of optical properties of a film-type single-wall carbon nanotubes saturable absorber (SWNT-SA) with an Er-doped all-fiber laser,” Opt. Express 20(12), 12966–12974 (2012).
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2010 (1)

2005 (1)

2003 (1)

1999 (1)

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
[Crossref]

1994 (1)

H. Lin, D. K. Donald, and W. V. Sorin, “Optimizing polarization states in a figure-8 laser using a nonreciprocal phase shifter,” J. Lightwave Technol. 12(7), 1121–1128 (1994).
[Crossref]

1993 (1)

1992 (1)

M. Hofer, M. H. Ober, F. Haberl, and M. E. Fermann, “Characterization of ultrashort pulse formation in passively mode-locked fiber lasers,” IEEE J. Quantum Electron. 28(3), 720–728 (1992).
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1990 (1)

1989 (1)

1988 (1)

Andrejco, M. J.

Bao, Q.

Barry, L. P.

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
[Crossref]

Boivinet, S.

S. Boivinet, S. Vidal, and J. Boullet, “178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 × 3 coupler at 1 µm,” Laser Phys. Lett. 17(5), 055102 (2020).
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Bollond, P. G.

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
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Boullet, J.

S. Boivinet, S. Vidal, and J. Boullet, “178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 × 3 coupler at 1 µm,” Laser Phys. Lett. 17(5), 055102 (2020).
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Bowen, P.

P. Bowen, M. Erkintalo, and N. G. R. Broderick, “Large net-normal dispersion Er-doped fibre laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Commun. 410, 447–451 (2018).
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Broderick, N. G. R.

P. Bowen, M. Erkintalo, and N. G. R. Broderick, “Large net-normal dispersion Er-doped fibre laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Commun. 410, 447–451 (2018).
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Cai, Y.

Chai, L.

Chen, B.

K. Wu, B. Chen, X. Zhang, S. Zhang, C. Guo, C. Li, P. Xiao, J. Wang, L. Zhou, W. Zou, and J. Chen, “High-performance mode-locked and Q-switched fiber lasers based on novel 2D materials of topological insulators, transition metal dichalcogenides and black phosphorus: review and perspective (invited),” Opt. Commun. 406, 214–229 (2018).
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Chen, J.

K. Wu, B. Chen, X. Zhang, S. Zhang, C. Guo, C. Li, P. Xiao, J. Wang, L. Zhou, W. Zou, and J. Chen, “High-performance mode-locked and Q-switched fiber lasers based on novel 2D materials of topological insulators, transition metal dichalcogenides and black phosphorus: review and perspective (invited),” Opt. Commun. 406, 214–229 (2018).
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Chen, S.

D. C. Kirsch, S. Chen, R. Sidharthan, Y. Chen, S. Yoo, and M. Chernysheva, “Short-wave IR ultrafast fiber laser systems: Current challenges and prospective applications,” J. Appl. Phys. 128(18), 180906 (2020).
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Y. Chen, G. Jiang, S. Chen, Z. Guo, X. Yu, C. Zhao, H. Zhang, Q. Bao, S. Wen, D. Tang, and D. Fan, “Mechanically exfoliated black phosphorus as a new saturable absorber for both Q-switching and Mode-locking laser operation,” Opt. Express 23(10), 12823–12833 (2015).
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Chen, Y.

D. C. Kirsch, S. Chen, R. Sidharthan, Y. Chen, S. Yoo, and M. Chernysheva, “Short-wave IR ultrafast fiber laser systems: Current challenges and prospective applications,” J. Appl. Phys. 128(18), 180906 (2020).
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Y. Chen, G. Jiang, S. Chen, Z. Guo, X. Yu, C. Zhao, H. Zhang, Q. Bao, S. Wen, D. Tang, and D. Fan, “Mechanically exfoliated black phosphorus as a new saturable absorber for both Q-switching and Mode-locking laser operation,” Opt. Express 23(10), 12823–12833 (2015).
[Crossref]

C. Zhao, H. Zhang, X. Qi, Y. Chen, Z. Wang, S. Wen, and D. Tang, “Ultra-short pulse generation by a topological insulator based saturable absorber,” Appl. Phys. Lett. 101(21), 211106 (2012).
[Crossref]

Chernysheva, M.

D. C. Kirsch, S. Chen, R. Sidharthan, Y. Chen, S. Yoo, and M. Chernysheva, “Short-wave IR ultrafast fiber laser systems: Current challenges and prospective applications,” J. Appl. Phys. 128(18), 180906 (2020).
[Crossref]

Cho, D. K.

Choi, S. Y.

Cleff, C.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Cui, J.

Cui, Y.

T. Jiang, Y. Cui, P. Lu, C. Li, A. Wang, and Z. Zhang, “All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror,” IEEE Photonics Technol. Lett. 28(16), 1786–1789 (2016).
[Crossref]

Dai, J.

J. Sun, Y. Zhou, Z. Ge, J. Yin, F. Yin, J. Dai, T. Zhang, and K. Xu, “Low-repetition-rate, high pulse energy all-polarization-maintaining Er-doped fiber laser mode-locked with a nonlinear amplifying loop mirror,” Laser Phys. Lett. 16(4), 045104 (2019).
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J. Sun, Y. Zhou, Y. Dai, J. Li, F. Yin, J. Dai, and K. Xu, “All-fiber polarization-maintaining erbium-doped dispersion-managed fiber laser based on a nonlinear amplifying loop mirror,” Appl. Opt. 57(6), 1492–1496 (2018).
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Dai, Y.

Deutsch, C.

Dinkelaker, A.

Dobner, S.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Donald, D. K.

H. Lin, D. K. Donald, and W. V. Sorin, “Optimizing polarization states in a figure-8 laser using a nonreciprocal phase shifter,” J. Lightwave Technol. 12(7), 1121–1128 (1994).
[Crossref]

Dong, T.

Y. Zhou, Y. Zeng, J. Yin, T. Dong, L. Sun, Y. Zhang, and K. Xu, “All-polarization-maintaining figure-of-9 soliton and dispersion-managed Er-doped fiber oscillators,” Laser Phys. 30(4), 045101 (2020).
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Doran, N. J.

Doubek, R.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Droste, S.

Dudley, J. M.

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
[Crossref]

Duncker, H.

Edelmann, M.

M. Edelmann, Y. Hua, K. Şafak, and F. X. Kärtner, “Intrinsic Amplitude-Noise Suppression in Fiber Lasers Mode-locked with Nonlinear Amplifying Loop Mirrors,” ArXiv201013824 Phys. (2020).

Erkintalo, M.

P. Bowen, M. Erkintalo, and N. G. R. Broderick, “Large net-normal dispersion Er-doped fibre laser mode-locked with a nonlinear amplifying loop mirror,” Opt. Commun. 410, 447–451 (2018).
[Crossref]

Fan, D.

Fellinger, J.

Feng, Y.

J. Zhou, W. Pan, X. Fu, L. Zhang, and Y. Feng, “Environmentally-stable 50-fs pulse generation directly from an Er:fiber oscillator,” Opt. Fiber Technol. 52, 101963 (2019).
[Crossref]

Fermann, M. E.

Fischer, M.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Fu, H. Y.

X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020).
[Crossref]

Fu, X.

J. Zhou, W. Pan, X. Fu, L. Zhang, and Y. Feng, “Environmentally-stable 50-fs pulse generation directly from an Er:fiber oscillator,” Opt. Fiber Technol. 52, 101963 (2019).
[Crossref]

Ge, Z.

J. Sun, Y. Zhou, Z. Ge, J. Yin, F. Yin, J. Dai, T. Zhang, and K. Xu, “Low-repetition-rate, high pulse energy all-polarization-maintaining Er-doped fiber laser mode-locked with a nonlinear amplifying loop mirror,” Laser Phys. Lett. 16(4), 045104 (2019).
[Crossref]

Gervaziev, M.

Giunta, M.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

M. Lezius, T. Wilken, C. Deutsch, M. Giunta, O. Mandel, A. Thaller, V. Schkolnik, M. Schiemangk, A. Dinkelaker, A. Kohfeldt, A. Wicht, M. Krutzik, A. Peters, O. Hellmig, H. Duncker, K. Sengstock, P. Windpassinger, K. Lampmann, T. Hülsing, T. W. Hänsch, and R. Holzwarth, “Space-borne frequency comb metrology,” Optica 3(12), 1381–1387 (2016).
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Grosinger, W.

Guanyu Liu, G. L.

Guo, C.

K. Wu, B. Chen, X. Zhang, S. Zhang, C. Guo, C. Li, P. Xiao, J. Wang, L. Zhou, W. Zou, and J. Chen, “High-performance mode-locked and Q-switched fiber lasers based on novel 2D materials of topological insulators, transition metal dichalcogenides and black phosphorus: review and perspective (invited),” Opt. Commun. 406, 214–229 (2018).
[Crossref]

Guo, L.

Guo, Z.

Haberl, F.

M. Hofer, M. H. Ober, F. Haberl, and M. E. Fermann, “Characterization of ultrashort pulse formation in passively mode-locked fiber lasers,” IEEE J. Quantum Electron. 28(3), 720–728 (1992).
[Crossref]

M. E. Fermann, F. Haberl, M. Hofer, and H. Hochreiter, “Nonlinear amplifying loop mirror,” Opt. Lett. 15(13), 752–754 (1990).
[Crossref]

Hänsch, T. W.

Hänsel, W.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Hartl, I.

Harvey, J. D.

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
[Crossref]

Hata, Y.

Haus, H. A.

He, M.

Heckl, O. H.

Hellmig, O.

Heyl, C. M.

Hochreiter, H.

Hofer, M.

M. Hofer, M. H. Ober, F. Haberl, and M. E. Fermann, “Characterization of ultrashort pulse formation in passively mode-locked fiber lasers,” IEEE J. Quantum Electron. 28(3), 720–728 (1992).
[Crossref]

M. E. Fermann, F. Haberl, M. Hofer, and H. Hochreiter, “Nonlinear amplifying loop mirror,” Opt. Lett. 15(13), 752–754 (1990).
[Crossref]

Holzwarth, R.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

M. Lezius, T. Wilken, C. Deutsch, M. Giunta, O. Mandel, A. Thaller, V. Schkolnik, M. Schiemangk, A. Dinkelaker, A. Kohfeldt, A. Wicht, M. Krutzik, A. Peters, O. Hellmig, H. Duncker, K. Sengstock, P. Windpassinger, K. Lampmann, T. Hülsing, T. W. Hänsch, and R. Holzwarth, “Space-borne frequency comb metrology,” Optica 3(12), 1381–1387 (2016).
[Crossref]

Hoogland, H.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Hu, M.

Hua, Y.

M. Edelmann, Y. Hua, K. Şafak, and F. X. Kärtner, “Intrinsic Amplitude-Noise Suppression in Fiber Lasers Mode-locked with Nonlinear Amplifying Loop Mirrors,” ArXiv201013824 Phys. (2020).

Hülsing, T.

Im, J. H.

Ippen, E. P.

Itoga, E.

Ivanenko, A.

Jeong, H.

Jiang, G.

Jiang, J.

Jiang, T.

K. Yin, Y.-M. Li, Y.-B. Wang, X. Zheng, and T. Jiang, “Self-starting all-fiber PM Er:laser mode locked by a biased nonlinear amplifying loop mirror,” Chin. Phys. B 28(12), 124203 (2019).
[Crossref]

T. Jiang, Y. Cui, P. Lu, C. Li, A. Wang, and Z. Zhang, “All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror,” IEEE Photonics Technol. Lett. 28(16), 1786–1789 (2016).
[Crossref]

Jiang, Y.

Jouhti, T.

Kadwani, P.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2µm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Kardas, T. M.

Karirinne, S.

Kärtner, F. X.

M. Edelmann, Y. Hua, K. Şafak, and F. X. Kärtner, “Intrinsic Amplitude-Noise Suppression in Fiber Lasers Mode-locked with Nonlinear Amplifying Loop Mirrors,” ArXiv201013824 Phys. (2020).

Kassani, S. H.

Kataura, H.

Kazaoui, S.

Kemmer, A.

Khazaeizhad, R.

Kim, D.

Kim, J.

Kim, K.

Kim, K.-S.

Kim, S.

Kirsch, D. C.

D. C. Kirsch, S. Chen, R. Sidharthan, Y. Chen, S. Yoo, and M. Chernysheva, “Short-wave IR ultrafast fiber laser systems: Current challenges and prospective applications,” J. Appl. Phys. 128(18), 180906 (2020).
[Crossref]

Klimczak, M.

Kobtsev, S.

Kohfeldt, A.

Kokhanovskiy, A.

Komarov, A.

Konttinen, J.

Krutzik, M.

Kuse, N.

Kwon, D.

Lampmann, K.

Lee, B.

Lee, C.-C.

Leonhardt, R.

J. M. Dudley, L. P. Barry, J. D. Harvey, M. D. Thomson, B. C. Thomsen, P. G. Bollond, and R. Leonhardt, “Complete characterization of ultrashort pulse sources at 1550 nm,” IEEE J. Quantum Electron. 35(4), 441–450 (1999).
[Crossref]

Lezius, M.

Li, C.

A. S. Mayer, W. Grosinger, J. Fellinger, G. Winkler, L. W. Perner, S. Droste, S. H. Salman, C. Li, C. M. Heyl, and O. H. Heckl, “Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties,” Opt. Express 28(13), 18946–18968 (2020).
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J. Fellinger, A. S. Mayer, G. Winkler, W. Grosinger, G.-W. Truong, S. Droste, C. Li, C. M. Heyl, I. Hartl, and O. H. Heckl, “Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser,” Opt. Express 27(20), 28062–28074 (2019).
[Crossref]

K. Wu, B. Chen, X. Zhang, S. Zhang, C. Guo, C. Li, P. Xiao, J. Wang, L. Zhou, W. Zou, and J. Chen, “High-performance mode-locked and Q-switched fiber lasers based on novel 2D materials of topological insulators, transition metal dichalcogenides and black phosphorus: review and perspective (invited),” Opt. Commun. 406, 214–229 (2018).
[Crossref]

T. Jiang, Y. Cui, P. Lu, C. Li, A. Wang, and Z. Zhang, “All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror,” IEEE Photonics Technol. Lett. 28(16), 1786–1789 (2016).
[Crossref]

Li, J.

Li, L.

Li, Q.

X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020).
[Crossref]

Li, R.

Li, Y.

Li, Y.-M.

K. Yin, Y.-M. Li, Y.-B. Wang, X. Zheng, and T. Jiang, “Self-starting all-fiber PM Er:laser mode locked by a biased nonlinear amplifying loop mirror,” Chin. Phys. B 28(12), 124203 (2019).
[Crossref]

Liao, R.

Lin, H.

H. Lin, D. K. Donald, and W. V. Sorin, “Optimizing polarization states in a figure-8 laser using a nonreciprocal phase shifter,” J. Lightwave Technol. 12(7), 1121–1128 (1994).
[Crossref]

Liu, B.

Liu, G.

X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020).
[Crossref]

S. Ou, G. Liu, L. Guo, Z. Zhang, and Q. Zhang, “870 fs, 448 kHz pulses from an all-polarization-maintaining Yb-doped fiber laser with a nonlinear amplifying loop mirror,” Appl. Opt. 57(18), 5068–5071 (2018).
[Crossref]

G. Liu, A. Wang, and Z. Zhang, “84-fs 500-MHz Yb:Fiber-Based Laser Oscillator Mode Locked by Biased NALM,” IEEE Photonics Technol. Lett. 29(23), 2055–2058 (2017).
[Crossref]

Liu, L. Y.

Liu, W.

Liu, X.

X. Liu, G. Liu, R. Zhou, D. Yu, J. Wu, H. Y. Fu, Z. Zhang, and Q. Li, “An all polarization-maintaining fiber laser mode locked by nonlinear amplifying loop mirror with different biases,” Laser Phys. 30(8), 085104 (2020).
[Crossref]

Lu, P.

T. Jiang, Y. Cui, P. Lu, C. Li, A. Wang, and Z. Zhang, “All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror,” IEEE Photonics Technol. Lett. 28(16), 1786–1789 (2016).
[Crossref]

Mandel, O.

Mayer, A. S.

Mayer, P.

W. Hänsel, H. Hoogland, M. Giunta, S. Schmid, T. Steinmetz, R. Doubek, P. Mayer, S. Dobner, C. Cleff, M. Fischer, and R. Holzwarth, “All polarization-maintaining fiber laser architecture for robust femtosecond pulse generation,” Appl. Phys. B 123(1), 41 (2017).
[Crossref]

Minami, N.

Mingareev, I.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2µm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Minoshima, K.

Miyashita, K.

Nakajima, Y.

Nishizawa, N.

Ober, M. H.

M. Hofer, M. H. Ober, F. Haberl, and M. E. Fermann, “Characterization of ultrashort pulse formation in passively mode-locked fiber lasers,” IEEE J. Quantum Electron. 28(3), 720–728 (1992).
[Crossref]

Oh, K.

Okhotnikov, O. G.

Olowinsky, A.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2µm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
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Ou, S.

Ozeki, Y.

H. Yoshimi, K. Sumimura, and Y. Ozeki, “An Er fiber laser generating multi-milliwatt picosecond pulses with ultralow intensity noise,” Jpn. J. Appl. Phys. 57(10), 108001 (2018).
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Pan, W.

J. Zhou, W. Pan, X. Fu, L. Zhang, and Y. Feng, “Environmentally-stable 50-fs pulse generation directly from an Er:fiber oscillator,” Opt. Fiber Technol. 52, 101963 (2019).
[Crossref]

Perner, L. W.

Pessa, M.

Peters, A.

Qi, X.

C. Zhao, H. Zhang, X. Qi, Y. Chen, Z. Wang, S. Wen, and D. Tang, “Ultra-short pulse generation by a topological insulator based saturable absorber,” Appl. Phys. Lett. 101(21), 211106 (2012).
[Crossref]

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Y. Zhou, Y. Zeng, J. Yin, T. Dong, L. Sun, Y. Zhang, and K. Xu, “All-polarization-maintaining figure-of-9 soliton and dispersion-managed Er-doped fiber oscillators,” Laser Phys. 30(4), 045101 (2020).
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Appl. Opt. (2)

Appl. Phys. B (1)

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Appl. Phys. Lett. (1)

C. Zhao, H. Zhang, X. Qi, Y. Chen, Z. Wang, S. Wen, and D. Tang, “Ultra-short pulse generation by a topological insulator based saturable absorber,” Appl. Phys. Lett. 101(21), 211106 (2012).
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Chin. Phys. B (1)

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[Crossref]

G. Liu, A. Wang, and Z. Zhang, “84-fs 500-MHz Yb:Fiber-Based Laser Oscillator Mode Locked by Biased NALM,” IEEE Photonics Technol. Lett. 29(23), 2055–2058 (2017).
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Lith. J. Phys. (1)

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Figures (9)

Fig. 1.
Fig. 1. Experimental setup. PM WDM: polarization-maintaining wavelength division multiplexer; PM EDF: polarization-maintaining erbium-doped fiber; PM SMF: polarization-maintaining single-mode fiber; LD: laser diode; col: collimator; PBC; polarization beam combiner; FR: Faraday rotator; QWP: quarter-wave plate; M: mirror.
Fig. 2.
Fig. 2. Measured output characteristics of both NALM output ports with net cavity dispersion equal to −0.034 ps2. (a) Optical spectra and spectral phases measured at both output ports. (b) Output port 1 RF spectrum (the resolution bandwidth of the measurement was 51 Hz); inset, RF spectrum measured in a 3.5 GHz span. (c) Autocorrelation traces of both output ports. (d) Reconstructed temporal intensity (black line), transform-limited intensity (dashed red line), and temporal phase of the pulse (dashed blue line) for both output ports. (e-f) Measured and retrieved FROG spectrograms at both output ports.
Fig. 3.
Fig. 3. Net cavity dispersion and repetition rate as a function of the PM SMF length.
Fig. 4.
Fig. 4. Optical spectra (a) and corresponding autocorrelation traces of the pulses (b) generated on output port 1 as a function of the net cavity dispersion.
Fig. 5.
Fig. 5. Optical spectra (a) and corresponding autocorrelation traces of the pulses (b) generated on output port 2 as a function of the net cavity dispersion.
Fig. 6.
Fig. 6. Characteristics of the output port 1: (a) optical spectra measured by the OSA (solid black line) and the FROG (red solid line) with retrieved spectral phase (dashed blue line). (b) Reconstructed temporal intensity (solid black line), transform-limited intensity (dotted red line), and temporal phase (dashed blue line).
Fig. 7.
Fig. 7. Characteristics of the output port 2: (a) Optical spectra measured by the OSA (solid black line) and the FROG (red solid line) with retrieved spectral phase (dashed blue line). (b) Reconstructed temporal intensity (solid black line), transform-limited intensity (dotted red line), and temporal phase (dashed blue line).
Fig. 8.
Fig. 8. Dispersion map of the resonator for propagation in (a) clockwise; (b) counterclockwise direction.
Fig. 9.
Fig. 9. Pulse duration, pulse energy, and spectral width (FWHM) as a function of net cavity dispersion for (a) output port 1; (b) output port 2.

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