Huang H, Xiao X, Burger M, Nees J, Jovanovic I
Opt Lett. 2022 Jul 1;47(13):3159-3162. doi: 10.1364/OL.458405.
We present a broadband light source based on near-infrared chirped-pulse difference-frequency mixing that is suitable for seeding long-wave-infrared (LWIR) optical parametric chirped-pulse amplification (OPCPA). A nitrocellulose pellicle is used in a Ti:sapphire regenerative amplifier to generate dual-frequency output pulses, which are subsequently mixed in a 0.4-mm thick AgGaS crystal. LWIR pulses with ∼1 µm full width at half maximum (FWHM) bandwidth centered at 10.5 µm are generated by mixing transform-limited pulses. Assisted by genetic algorithm optimization, the bandwidth is broadened to ∼3 µm FWHM within the 8-12 µm atmospheric transmission window. The seed source paves the path towards tabletop ultrafast terawatt-class passively carrier-envelope-phase stabilized OPCPA in the LWIR region.
我们展示了一种基于近红外啁啾脉冲差频混频的宽带光源，它适用于为长波红外（LWIR）光学参量啁啾脉冲放大（OPCPA）提供种子光。在钛宝石再生放大器中使用硝化纤维素薄膜来产生双频输出脉冲，随后这些脉冲在一块0.4毫米厚的AgGaS晶体中进行混频。通过混频变换极限脉冲产生了半高全宽（FWHM）带宽约为1 µm、中心波长为10.5 µm的LWIR脉冲。在遗传算法优化的辅助下，带宽在8 - 12 µm大气传输窗口内拓宽至约3 µm FWHM。该种子光源为在LWIR区域实现桌面超快太瓦级被动载波包络相位稳定的OPCPA铺平了道路。
