Chen B-H, Nagy T, Baum P
Opt Lett. 2018 Apr 15;43(8):1742-1745. doi: 10.1364/OL.43.001742.
We report a surprisingly broadband and efficient midinfrared pulse generation in LiGaS (Langasite, LGS) by invoking a simultaneous interplay of intrapulse difference-frequency generation, self-phase modulation, and dispersion. This cascaded mechanism expands the output bandwidth and output power at the same time. With 30-fs driving pulses centered at 1030-nm wavelength we obtain a broadband middle-infrared spectrum of 8-11 μm with an LGS crystal as thick as 4 mm, which is eight times longer than the walk-off length.
我们报告了通过脉冲内差频产生、自相位调制和色散的同时相互作用，在LiGaS（硅酸镓镧，LGS）中实现了令人惊讶的宽带高效中红外脉冲产生。这种级联机制同时扩展了输出带宽和输出功率。以中心波长为1030 nm的30 fs驱动脉冲，我们使用厚度为4 mm的LGS晶体获得了8 - 11μm的宽带中红外光谱，其长度比走离长度长八倍。
