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arXiv 1811.03225physics.optics
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4.2-16 μm超宽闲频多微焦GaSe-based中红外光参量放大器

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

摘要:

报道了一种基于GaSe非线性晶体的多微焦超宽带中红外光参量放大器。产生的闲频脉冲在-3dB处具有平坦的光谱,其中心波长为8.8 μm,在整个光谱范围内的光谱宽度为4.2 ~ 16 μm,在-3dB处的光谱宽度为4.5 ~ 13.3 μm。所提出的方案支持子周期傅里叶变换限制的脉冲宽度。采用(2+1)维数值模拟再现了所得到的闲频谱。据我们所知,这是光学参量放大器在该光谱区域中获得的最宽的-3 dB光谱。闲频脉冲能量约为3.4 μJ,从2 μm泵浦光到闲频脉冲的转换效率约为2%。

英文摘要:

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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