论文部分内容阅读
根据Siegman的被动调Q判据 ,Nd∶YVO4晶体由于受激发射截面大、上能级寿命短 ,很难获得被动调Q输出。利用LD光纤耦合端面泵浦Nd∶YVO4晶体 ,在泵浦功率 3.5W时 ,连续运转获得最大输出 1 .4W ,相应的光光转换效率为 40 % ,同时采用Cr4+ ∶YAG可饱和吸收体 ,成功地实现了Nd∶YVO4被动调Q运转 ,获得了脉宽1 1 .7ns ,重复频率 2 2kHz调Q输出。
According to Siegman’s passive Q-switched criterion, Nd: YVO4 crystals are difficult to obtain passive Q-switched output due to the large stimulated emission cross-section and high energy level lifetime. The LD fiber-coupled end-pumped Nd: YVO4 crystal was used to obtain the maximum output of 1.4 W at a pump power of 3.5 W and the corresponding light-to-light conversion efficiency of 40%. The Cr4 +: YAG saturable absorber was used successfully The Nd: YVO4 passive Q-switched operation was realized, and a pulse width of 11.7 ns and a repetitive frequency of 2 2 kHz Q-switched output were obtained.