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Thin-disk multipass amplifier delivering sub-400 fs pulses with excellent beam quality at an average power of 1 kW

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Abstract

We present an improved multipass amplifier design, enabling the amplification of ultrashort pulses with excellent beam quality to more than 1 kW of average output power. 260 fs short pulses at an average power of 105 W and a repetition rate of 1 MHz were directly amplified up to an average power of 1033 W. The pulse duration at this power level was measured to be 388 fs assuming a Gaussian temporal shape. This corresponds to a peak power of 2.5 GW. The power stability was measured to be 0.16% RMS over a duration of more than two hours at a sampling rate of 2 Hz. High beam quality is proven with measured values of $\textrm{M}_\textrm{x}^\textrm{2}\textrm{ = 1}\textrm{.16}$ in the horizontal and $\textrm{M}_\textrm{y}^\textrm{2}\textrm{ = 1}\textrm{.19}$ in the vertical plane according to ISO Standard 11146.

© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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Corrections

11 April 2022: A typographical correction was made to the body text.


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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (10)

Fig. 1.
Fig. 1. (a) Top view of the setup of the thin-disk multipass amplifier (a). The beam rotator (BR) consists of three high-reflective (HR) 45°-folding mirrors (b). LW: Laser window, F1-3: folding mirror 1-3, BR: beam rotator, RMP: retro-reflecting mirror pair.
Fig. 2.
Fig. 2. Side view of one mirror mounted in the water-cooled mirror array. The mount’s kinematic is protected against stray light by the larger HR-coated front surface of the mirror. The access to alignment is enabled through openings in the base plate of the mirror array.
Fig. 3.
Fig. 3. Calculated beam caustic in the TDMPA without (a) and with (b) beam rotator. A collimated beam with a diameter of 4.5 mm is launched into the system. The thin disk is the only curved element with a radius of curvature (RoC) of 20 m. The RoC in the vertical direction (y-axis) is larger than in the horizontal direction (x-axis) by a factor of 1.05 (≈ 21 m). The beam rotator was located after the 20th reflection at the disk, corresponding to half of the propagation distance as indicated by the green line.
Fig. 4.
Fig. 4. Simulated ratio of the output beam’s diameter and divergence for different astigmatism of the disk without (a) and with the beam rotation (b).
Fig. 5.
Fig. 5. Average output power and extraction efficiency (seed power of 105 W subtracted) of the amplified beam as a function of the pump power launched into the pump module.
Fig. 6.
Fig. 6. (a) AC-trace of the pulses at the average powers of 72 W and 1033 W. (b) Spectra of the seed pulses (black line), at 72 W of average output power (blue line), and at 1033 W of average power (red line).
Fig. 7.
Fig. 7. Caustic of the seeded laser beam before injection into the TDMPA at 105 W of average power (a), and after propagation through the unpumped TDMPA at 72 W of transmitted average power (b), and of the amplified laser beam at 1033 W of average power (c). Far- and near-field intensity profiles of the seeded beam (d), of the seeded beam propagated through the unpumped TDMPA (e), and of the amplified beam at 1033 W of average power (f).
Fig. 8.
Fig. 8. Beam propagation factor measured as function of output power.
Fig. 9.
Fig. 9. Average output power as a function of the time at 1770 W of pump power.
Fig. 10.
Fig. 10. Beam propagation factor in dependence of the time at constant pump power of 1770 W. The insets show the intensity profiles in the near field.
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