Wei Disheng, Tang Jinwen, Li Junhui, Hua Xiaoxiao, Wu Minglang, Cheng Wenhao, Zhang Runming, Yao Baoquan, Dai Tongyu, Duan Xiaoming
Opt Lett. 2024 Aug 1;49(15):4290-4293. doi: 10.1364/OL.533294.
In this Letter, we report for the first time to our knowledge a 2 mJ-level 2.09 µm Ho:YAG regenerative amplifier (RA) seeded by the first-stage Ho-doped fiber (HDF) preamplifier of a gain-switched laser diode (GSLD). After the single-pass power amplifier (SPPA), the output of a 2.09 µm pulse laser with 1 kHz, 570 ps, and >10 mJ was achieved. The overall gain of the whole amplifier system was greater than 90 dB, providing a novel, stable, and reliable sub-nanosecond (sub-ns) pump source operating at a pulse repetition frequency (PRF) of 1 kHz for an optical parametric generator (OPG) based on ZnGeP (ZGP). Specifically, for the ZGP OPG structure, a maximum pulse energy of 1.82 mJ at 3-5 µm had been achieved with an injected pump pulse energy of 5.47 mJ, corresponding to a slope efficiency of 39.5% and an optical-to-optical conversion efficiency (OOCE) of 33.27%.
在本信函中，据我们所知，我们首次报道了一种由增益开关激光二极管（GSLD）的一级掺钬光纤（HDF）前置放大器泵浦的2 mJ级2.09 µm钬：钇铝石榴石再生放大器（RA）。经过单通功率放大器（SPPA）后，实现了输出波长为2.09 µm、重复频率为1 kHz、脉宽为570 ps且能量大于10 mJ的脉冲激光。整个放大器系统的总增益大于90 dB，为基于ZnGeP（ZGP）的光参量发生器（OPG）提供了一种新颖、稳定且可靠的亚纳秒（sub-ns）泵浦源，其脉冲重复频率（PRF）为1 kHz。具体而言，对于ZGP OPG结构，在注入泵浦脉冲能量为5.47 mJ的情况下，在3 - 5 µm波长处实现了1.82 mJ的最大脉冲能量，对应斜率效率为39.5%，光光转换效率（OOCE）为33.27%。
