KTP晶体热效应与光束质量改善研究  

Study on thermal-lens effect of KTP crystal and improvement of beam quality

作　　者：张晶[1] 毕勇[2] 樊仲维[3] 石朝辉[1] 张瑛[3] 崔建峰[1] 裴博[3] 赵剑波[3] 

机构地区：[1]中果科学院长春光学精密机械与物理研究所 [2]中国科学院光电研究院,北京100080 [3]北京国科世纪激光技术有限公司,北京100085

出　　处：《激光杂志》2006年第6期1-2,共2页Laser Journal

基　　金：国家863计划项目(2002AA311020);北京市科技计划(H02040070011)资助项目支持

摘　　要：讨论了腔内倍频KTP晶体的热透镜效应,计算了平平谐振腔中KTP晶体在最大泵浦功率为180W时的热焦距为853mm;并在此基础上优化了腔型,改善了光束质量。实验中采用了9个20W的高功率半导体激光器侧面抽运的单Nd:YAG棒、单声光Q开关、高效小曲率凸凸腔内倍频谐振腔结构,对KTP晶体和Q开关采取适当的冷却方式,最终实现了光束质量因子M2达3.16,功率稳定性RMS值为0.781%,平均功率为16W的高功率高光束质量的激光器稳定性运转。The thermal effect of nonlinear crystal KTP is discussed in this paper. The thermal focal length of KTP in the F/F resonant cavity is calculated 853mm theoretically under the muximal pumping power 180W. At the same time we optimized the design of the. resonant cavity with the results mentioned above. In the expefiment, we adopted 9 LD bars each of which haa 20W output power to side pump single Nd：YAG stick, single Q-switch. And it is the first tire, to our best knowledge, to use highly active convex - convex resonant cavity structure, which realized M^2 factor 3.16, the output power stability of the laser RMS 0. 781% and the 16W average output power after assuming apporopriate coolant system.

关 键 词：光束质量 激光技术 热透镜效应 KTP晶体 

分 类 号：TN248.1[电子电信—物理电子学]