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为了获得高重频窄脉冲高光束质量激光输出,采用了LD抽运Nd:YVO4晶体声光调Q方案,进行了相关理论分析和实验验证,获得了振荡级获得了重频25 k Hz、单脉冲能量22.4μJ、脉冲宽度2.19 ns、光束质量M2<1.2的种子激光,光光效率为24.3%;放大级获得了重频25 k Hz、单脉冲能量585μJ、脉冲宽度2.26 ns、光束质量M2<1.7的激光输出,提取效率为15.6%。结果表明,采用LD抽运Nd:YVO4晶体声光调Q方案能够获得高重频窄脉冲高光束质量激光输出,其实验现象与理论计算结果较为符合。
In order to obtain high-repetition-rate, narrow-pulse, high-beam-quality laser output, the LD pumping Nd: YVO4 crystal acoustooptic Q scheme was used to conduct theoretical analysis and experimental verification. The pulse light energy of 22.4μJ, the pulse width of 2.19 ns and the beam quality of M2 <1.2 was 24.3% for the seed laser. The repeater 25 k Hz, single pulse energy 585μJ, pulse width 2.26 ns and beam quality M2 < 1.7 laser output, extraction efficiency of 15.6%. The experimental results show that the high-frequency, narrow-pulse and high-beam laser output can be obtained by using LD pumping Nd: YVO4 crystal acousto-optic Q-switched scheme. The experimental results are in good agreement with the theoretical results.