Qu Shizhen, Liang Houkun, Liu Kun, Zou Xiao, Li Wenkai, Wang Qi Jie, Zhang Ying
Opt Lett. 2019 May 15;44(10):2422-2425. doi: 10.1364/OL.44.002422.
We report a long-wavelength mid-infrared (mid-IR), few-cycle optical parametric chirped-pulse amplifier (OPCPA) based on LiGaS crystals, pumped by a 1 μm Yb:YAG laser, at a 10 kHz repetition rate. The mid-IR OPCPA system generates pulses centered at 9 μm, with 1 4 μJ pulse energy and 140 mW average power. A 142 fs pulse width, which corresponds to less than 5 optical cycles at 9 μm, is measured by an interferometric autocorrelator. This is, to the best of our knowledge, the first long-wavelength mid-IR OPCPA pumped at 1 μm wavelength. It paves the way for the energy and power scaling of the ultrafast long-wavelength mid-IR lasers by utilizing advanced high-energy, high-power 1 μm pump lasers.
我们报道了一种基于LiGaS晶体的长波长中红外（mid-IR）、少周期光参量啁啾脉冲放大器（OPCPA），由1μm的Yb:YAG激光器泵浦，重复频率为10kHz。该中红外OPCPA系统产生中心波长为9μm的脉冲，脉冲能量为14μJ，平均功率为140mW。通过干涉自相关仪测量得到142fs的脉冲宽度，这在9μm波长下对应不到5个光学周期。据我们所知，这是首个由1μm波长泵浦的长波长中红外OPCPA。它通过利用先进的高能量、高功率1μm泵浦激光器，为超快长波长中红外激光器的能量和功率扩展铺平了道路。
