二极管泵浦Nd:YAG棒双通放大器技术
Study on Nd:YAG rods double-pass amplifying side-pumped by diode laser arrays
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摘要: 二极管泵浦Nd:YAG棒双通放大器采用两个峰值功率6.5 kW激光泵浦模块作为泵浦源。每个激光泵浦模块由81个二极管激光器组成,Nd:YAG棒直径为6 mm,Nd掺杂质量分数1%。在两个封装方式和结构一致的激光泵浦模块之间采用光学像传递和插入90°石英旋转片进行退偏补偿。在重复频率400 Hz,谐振腔输出单脉冲能量6 mJ时,双通输出400 mJ,激光器光-光转换效率为12.3%,光束质量4.6,脉宽15 ns。Abstract: A diode laser pumped Q-switched double-pass MOPA system operated on 400 Hz repetition rate and 15 ns pulse width has been investigated in this paper. The laser with a beam expanded mirror and a beam isolated equipment is amplified by two 6.5 kW diode laser pumped modules, each has 81 diode lasers. Two modules pumping Nd:YAG rod is used. Compensation of thermal birefringence is achieved by inserting a 90°crystal quartz rotator and using an imaging optical system between the two module. Besides, two appropriate concave lenses are placed on both sides of each pumped module for thermal lensing compensation. Accordingly, approximate apparel beam can be obtained through laser rods. The laser system developed can output 400 mJ energ with an optical-optical efficiency of 12.3% and beam quality of
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Key words:
- diode laser /
- double-pass amplifier /
- nd:yag rod
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