高效高稳定高光束质量声光调Q绿光激光器的研究

通过优化双棒串接直腔结构设计，利用大功率LD侧面抽运、声光Q开关、Ⅱ类相位匹配S-KTP内腔倍频获得高效大功率绿色激光输出.当抽运电流为45 A、重复频率为15 kHz时，激光平均功率为132 W，光—光转换效率为132％，脉宽约为120 ns.在输出130 W时，测得1 h功率不稳定度小于05%，光束质量因子M²为67.对高功率抽运情况下激光介质的热透镜效应以及谐振腔稳定运转工作区域也进行了理论分析和实验研究. 关键词： 绿光激光器 腔内倍频 声光调Q LD侧面抽运

Study of acousto-optic Q-switched green laser with high efficiency, high stability and high-quality coherent beam generation

High-power and high efficient coherent beam generation with good green-beam quality has been achieved by optimizing the diode-side-pumped linear cavity geometry with two modules in tandem, acousto-optic Q-switching and with S-KTP of Ⅱ-type phase-matching for intracavity frequency doubling of a Nd：YAG laser. When the pump current is 45A, the maximum average green output power of 132 W is obtained with pulse width of 120 ns at pulse repetition rate of 15 kHz, corresponding to the conversion efficiency of 132% from diode pump power to green output power. The M² beam quality factor is 67 at output power of 130 W, and the output power instability is less than 05% at the same output power during an hour measurement time. The thermo-lensing effect of the laser medium and the stable region of the laser cavity under high power pumping are also theoretically analyzed and experimentally researched.