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报道了绿光平均功率达138 W的声光调Q内腔倍频全固态Nd∶YAG绿光激光器。为了进一步提高绿光激光器的输出功率以及压窄脉宽,通过倍频晶体相位匹配角随温度变化的分析以及腔型的研究,设计并优化了U型谐振腔。实验中采用两个聚光腔,每个聚光腔由35个20 W的高功率激光二极管(LD)侧面抽运Nd∶YAG棒,利用Ⅱ类相位匹配KTP晶体腔内倍频,实现了高平均功率内腔倍频激光器的稳定运转。在两个聚光腔的激光二极管抽运电流分别为18.5 A,20.5 A时,获得了重复频率为10 kHz,脉冲宽度优于49 ns,输出功率为138 W的高功率、高重复频率、窄脉宽绿光(532 nm)输出,光-光转换效率为14.1%,不稳定度为±2.8%。
The acousto-optic Q-switched all-solid-state Nd: YAG green laser with an average green power of 138 W has been reported. In order to further improve the output power and the narrow pulse width of the green laser, a U-shaped resonator is designed and optimized by analyzing the phase-matching angle of the double-frequency crystal with the temperature variation and cavity type. Two converging cavities are used in the experiment. Each concentrating cavity is pumped by Nd: YAG rods from 35 20 W high-power laser diodes (LDs). Using the phase-matched phase-matched KTP crystal, The average power lumen frequency double laser stable operation. When the laser diode pumping currents of the two converging cavities are 18.5 A and 20.5 A respectively, a high power, high repetition frequency with a repetition frequency of 10 kHz, a pulse width of better than 49 ns and an output power of 138 W The pulse width of the green light (532 nm) output, light - light conversion efficiency of 14.1%, instability of ± 2.8%.