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417 W, 2.38 mJ Innoslab amplifier compressible to a high pulse quality of 406 fs

Yongxi Gao, Jie Guo, Yuguang Huang, Zichen Gao, Zebiao Gan, Zhihua Tu, Xiaoyan Liang, and Ruxin Li

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Abstract

We demonstrate a 417 W, 175 kHz Innoslab chirped pulse amplification laser compressible to short and clean 406 fs pulse duration. A spectral bandwidth (full width at half maximum, FWHM) of ∼3 nm was maintained at full pump power, and the pulses exhibited good pulse quality in a wide tunable pulse energy range from 1.7 mJ to a maximum of 2.38 mJ. At the maximum output power, the compressed pulses were nearly pedestal free. The comprehensive effects of residual high-order dispersion from the front end, the gain shaping effects of the amplifier, and the slight mismatch of third-order dispersion (TOD) between the stretcher (CFBG) and the gating compressor, along with the small nonlinear phase shift accumulated in the amplifier, could have facilitated the high pulse quality. To the best of our knowledge, this is the shortest pulse duration from the Innoslab amplifiers at hundreds of watts average power in the millijoule energy regime.

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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 (7)
Fig. 1.
Fig. 1. Schematic of the Innoslab amplifier-based CPA system. BS1, BS2: beam splitter, M1–M9: mirrors, L1, L2: spherical lenses, C1–C4: cylindrical lenses.

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Fig. 2.
Fig. 2. Amplified output power versus the incident pump power.

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Fig. 3.
Fig. 3. Stability of the output power during an hour.

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Fig. 4.
Fig. 4. Innoslab amplifier output spectrum versus the output power.

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Fig. 5.
Fig. 5. Innoslab amplifier output spectral bandwidth (FWHM) evolution under increasing pump power.

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Fig. 6.
Fig. 6. Compressed pulse duration measured by the second harmonic autocorrelation; sech2 fit corresponds to pulse duration of 406 fs FWHM at the maximum output power.

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Fig. 7.
Fig. 7. Compressed pulse autocorrelation function (ACF) measured by the second harmonic autocorrelation of the front end and the amplifier at the maximum output power.

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