设计并实现了473nm和946nm双波长输出的全固态Nd:YAG激光器。利用激光二极管端面泵浦Nd:YAG晶体,在三镜折叠谐振腔中插入Brewster窗片作为起偏器,通过周期极化晶体PPKTP内腔倍频获得473nm蓝光输出。同时利用Nd:YAG激光晶体的热退偏效应,把Brewster窗片作为基频光输出耦合镜,实现946nm激光输出。通过调谐PPKTP的温度,优化了倍频光和基频光的输出功率。泵浦功率25 W时,实验获得了1.8W的473nm倍频蓝光和0.8W的946nm基频激光输出。
We report an all-solid-state dual-wavelength laser at 473 nm and 946 nm. By the way of composite crystal Nd. YAG end-pumped by a laser diode at the central wavelength of 808 nm, the threemirror folded cavity is designed to realize laser output. The periodically poled crystal PPKTP is employed as frequency doubling crystal. Given the existence of thermal depolarization of Nd: YAG crystal, the Brewster plate is inserted into the cavity as a polarizer and output coupler of fundamental laser. The output power of 1. 8 W at 473 nm and of O. 8 W at 946 nm is obtained simultaneously at the pump power of 25W.