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arXiv · 1811.03225

Multi-microjoule GaSe-based mid-infrared optical parametric amplifier with an ultra-broad idler spectrum covering 4.2-16 μm

Kun Liu·Houkun Liang·Lifeng Wang·Shizhen Qu·Tino Lang·Hao Li·Qi Jie Wang·Ying Zhang
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Abstract

We report a multi-microjoule, ultra-broadband mid-infrared optical parametric amplifier based on a GaSe nonlinear crystal pumped at ~2 μm. The generated idler pulse has a flat spectrum spanning from 4.5 to 13.3 μm at -3 dB and 4.2 to 16 μm in the full spectral range, with a central wavelength of 8.8 μm. The proposed scheme supports a sub-cycle Fourier-transform-limited pulse width. A (2+1)-dimensional numerical simulation is employed to reproduce the obtained idler spectrum. To our best knowledge, this is the broadest -3 dB spectrum ever obtained by optical parametric amplifiers in this spectral region. The idler pulse energy is ~3.4 μJ with a conversion efficiency of ~2% from the ~2 μm pump to the idler pulse.

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Kun Liu, Houkun Liang, Lifeng Wang, Shizhen Qu, Tino Lang, Hao Li, Qi Jie Wang, Ying Zhang. 2019-07-29. Multi-microjoule GaSe-based mid-infrared optical parametric amplifier with an ultra-broad idler spectrum covering 4.2-16 μm. https://doi.org/10.1364/ol.44.001003

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