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采用光纤耦合输出激光二极管单端端面抽运Nd∶YAG晶体,考虑到晶体的热透镜效应,优化设计了四镜折叠环形腔,使抽运光斑的大小和振荡光斑的大小符合模式匹配的要求;在腔内插入偏振片、法拉第旋光器和半波片从而实现激光的单向运转以抑制空间烧孔效应;同时利用偏振片补偿了一定的像散;并在腔内加入标准具,压缩单频激光的线宽,最终实现连续单频1064 nm激光输出。在7 W抽运功率时,输出了2 W的单频激光,斜率效率为37%,单频激光的线宽为50 MHz,M2因子约为1.2。
The Nd: YAG crystal was pumped by single-ended end-facet of fiber-coupled laser diode. Considering the thermal lens effect of the crystal, a four-mirror folded ring cavity was optimized to match the size of the pumping spot and the size of the oscillating spot with the pattern matching. Polarizing plate, Faraday rotator and half-wave plate are inserted in the cavity so as to realize one-way operation of the laser to suppress space burning hole effect; at the same time, some astigmatism is compensated by the polarizer; and etalon is added in the cavity to compress the single frequency Laser line width, the final single-frequency continuous 1064 nm laser output. At 7 W pumping power, a 2 W single-frequency laser is output with a slope efficiency of 37%, a single-frequency laser with a linewidth of 50 MHz and an M2 factor of about 1.2.