Wang Yisen, Tan Weifeng, Chen Peining, Dai Shibo, Zhu Siqi, Yin Hao, Li Zhen, Chen Zhenqiang
Opt Lett. 2024 Aug 1;49(15):4270-4273. doi: 10.1364/OL.530327.
We report on a high average power and high repetition rate nanosecond pulsed eye-safe KGW Raman laser intracavity driven by an acousto-optic Q-switched 1342 nm two-crystal Nd:YVO laser. Taking advantages of the carefully selected two-composite-laser-crystal configuration, the thoroughly optimized gate-open time of acousto-optic modulator and the ingeniously designed U-shaped resonator, substantial power and efficiency enhancements as well as superior mode matching have been enabled. Under the injected pump power of 64.5 W, the average output powers of the first-Stokes fields at 1496 and 1527 nm can be up to 8.1 and 9.5 W with 25 kHz repetition rate and 3.2 µs gate-open time, respectively, corresponding to the optical power conversion efficiencies of 12.6% and 14.7%. Meantime, the resultant pulse widths are determined to be 4.6 and 6.3 ns with the peak powers of approximately 70 and 60 kW, respectively. The beam quality can be maintained with M < 1.5 across the entire output power range.
我们报道了一种由声光调Q的1342 nm双晶体Nd:YVO激光器腔内驱动的高平均功率、高重复频率纳秒脉冲人眼安全KGW拉曼激光器。利用精心选择的双复合激光晶体结构、声光调制器完全优化的开门时间以及巧妙设计的U形谐振器，实现了功率和效率的大幅提高以及卓越的模式匹配。在64.5 W的注入泵浦功率下，1496和1527 nm处第一斯托克斯场的平均输出功率分别可达8.1和9.5 W，重复频率为25 kHz，开门时间为3.2 µs，对应的光功率转换效率分别为12.6%和14.7%。同时，所得脉冲宽度分别确定为4.6和6.3 ns，峰值功率分别约为70和60 kW。在整个输出功率范围内，光束质量可保持在M < 1.5。
