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Polarization-maintaining, high-energy, wavelength-tunable, Er-doped ultrashort pulse fiber laser using carbon-nanotube polyimide film

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Abstract

A high-energy, wavelength-tunable, all-polarization-maintaining Er-doped ultrashort fiber laser was demonstrated using a polyimide film dispersed with single-wall carbon nanotubes. A variable output coupler and wavelength filter were used in the cavity configuration, and high-power operation was demonstrated. The maximum average power was 12.6 mW and pulse energy was 585 pJ for stable single-pulse operation with an output coupling ratio as high as 98.3%. Wide wavelength-tunable operation at 1532–1562 nm was also demonstrated by controlling the wavelength filter. The RF amplitude noise characteristics were examined in terms of their dependence on output coupling ratio and oscillation wavelength.

©2009 Optical Society of America

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Figures (10)

Fig. 1
Fig. 1 Configuration of all-PM, passively mode-locked, Er-doped ultrashort-pulse fiber laser with SWNT polyimide film. WDM, wavelength-division-multiplexed coupler; EDF, Er-doped fiber.
Fig. 2
Fig. 2 Absorption spectrum of SWNT-polyimide film. The SWNTs were synthesized by the LA method.
Fig. 3
Fig. 3 Output power and operating mode of the laser as a function of pump power when the output coupling ratio was 85%.
Fig. 4
Fig. 4 Characteristics of output pulses from fiber laser when the output coupling ratio was 85%, showing optical spectra on (a) linear and (b) log scales, (c) temporal pulse shape and instantaneous wavelength, and (d) pulse train.
Fig. 5
Fig. 5 Variation of maximum output power, power inside the cavity, and the temporal width of the output pulses as a function of output coupling ratio.
Fig. 6
Fig. 6 (a) Optical spectrum of output pulse when the maximum output power was obtained. Wavelength filters with bandwidths of 30 and 13 nm were used. (b) Temporal shape of the laser output.
Fig. 7
Fig. 7 (a) RF noise spectra of output pulse from fiber laser when the output coupling ratio was 98%, and (b) variation of averaged RF noise as a function of output coupling ratio.
Fig. 8
Fig. 8 Variation of optical spectra of output pulses for wavelength-tunable operation.
Fig. 9
Fig. 9 Output power and optical spectrum width when the center wavelength was varied.
Fig. 10
Fig. 10 Variation of magnitude of RF noise as a function of wavelength. Several output coupling ratios were examined.
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