非稳腔大功率绿光激光器的研究  

Study on high power green lasers with unstable resonators

作　　者：欧天有[1] 张宁[1] 庞庆生[2] 李港[2] 

机构地区：[1]中国人民解放军61711部队 [2]北京工业大学激光工程研究院

出　　处：《激光技术》2012年第1期87-89,137,共4页Laser Technology

摘　　要：为了提高激光的光束质量和提供准直的平行光束,为抽运钛宝石提供优良的大功率的绿光抽运源,对激光二极管侧面抽运Nd∶YAG声光调Q腔内倍频固体激光器进行了研究。实验中采用凸平直线非稳腔,将凸面镜和增益介质热透镜效应等效为望远镜系统进行分析。由实验可知,凸平非稳腔具有较大模体积、良好的稳定性等优点;利用二类相位匹配的磷酸钛氧钾晶体进行腔内倍频,当抽运功率为200W时,获得脉宽109ns、重复频率9.3kHz、发散角小于2mrad的42W绿光输出,光光转换效率达到21%,24h长时间的工作,不稳定性小于2%。结果表明,利用非稳腔腔型,在侧面抽运的模块中可以实现高效的大功率绿光输出。In order to improve its laser beam quality, obtain collimated laser beam and provide an excellent high-power green laser source to pump Ti： sapphire, a diode-side-pumped acoustic-optic Q-switched intra-cavity frequency doubling Nd：YAG laser was studied. In the experiment, a convex-plane unstable resonator was adopted assuming the convex mirrors and gain medium thermal lens as a telescope system. Experimental results show that a convex-plane unstable resonator has lager mode volume and better stability. Using a second type phase-matched KTP（KTiOPQ） for intra-cavity frequency doubling, with 200W pump power, 42W green laser was output with 109ns pulse width, 9.3kHz pulse repetition frequency, less than 2mrad divergent angle, 21% optical-optical conversion efficiency and instability less than 2% during 24h work. It is proven that an effective output of green laser can be achieved with an unstable resonator and side pump module.

关 键 词：激光器 非稳腔 绿光激光器 平凸谐振腔 

分 类 号：TN248.1[电子电信—物理电子学]