中国激光, 2006, 33 (8): 1017, 网络出版: 2006-08-31
138 W窄脉宽全固态绿光激光器
138 W Narrow Pulse-Width Solid-State Green Laser Operation
激光技术 Nd∶YAG激光器 U型谐振腔 532 nm绿光 内腔倍频 窄脉宽 laser technique Nd∶YAG laser U type cavity green beam at 532 nm intracavity frequency doubling narrow pulse-width
摘要
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%。
Abstract
An average power of 138 W green beam operation by intracavity frequency doubling of acousto-optic Q-switch solid-state Nd∶YAG laser is reported. An U type resonator is designed and optimized in order to compress pulse-width and increase the average power. Two Nd∶YAG rods were employed and a type Ⅱ phase matched KTP crystal (=25°, θ=90° under the condition of 24 ℃, the size is 7 mm×7 mm×7 mm) was applied for frequency doubling. Under the pumping currents of 18.5 A and 20.5 A, a maximum green power of 138 W was generated at 10 kHz repetition rate and 49 ns pulse-width, leading to 14.1% of optical-optical conversion efficiency and ±2.8% instability.
参考文献
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王暖让, 王灿召, 苑利钢, 姜东升, 杨苏辉, 赵长明. 138 W窄脉宽全固态绿光激光器[J]. 中国激光, 2006, 33(8): 1017. 王暖让, 王灿召, 苑利钢, 姜东升, 杨苏辉, 赵长明. 138 W Narrow Pulse-Width Solid-State Green Laser Operation[J]. Chinese Journal of Lasers, 2006, 33(8): 1017.
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