LDA泵浦Cr^(4+):YAG被动调QNd:YAG激光器实验研究

Experimental study on LDA pumped Nd:YAG Laser passively Q-switched by Cr^(4+):YAG

采用300W准连续激光二极管阵列LDA端面泵浦Nd:YAG晶体,微柱透镜和透镜导管耦合,Cr4+:YAG可饱和吸收体被动调Q,实现调Q脉冲输出,激光腔长4.5cm,Cr4+:YAG晶体初始透过率Tcr=73.2%,泵浦能量63.48mJ,输出单脉冲激光,脉冲宽度10ns,单脉冲能量3.42mJ,输出脉冲被调制并产生明显尾脉冲现象,分析了原因,说明调制脉冲是由于空间电磁辐射干扰,Cr4+:YAG晶体的慢恢复可饱和吸收特性导致尾脉冲产生。

A passively Q- switch QCW- 300W LAD end- pumped Nd：YAG laser using Cr^4＋：YAG as a saturable absorber is reported. Coupling system of the laser are microcylindrical lens array and lens duct,which are made by us.The Q - switch laser lenth is 4.5cm,using a 73.2% initial transmmion Cr^4＋： YAG crystal. At a pumped power 63.48mJ, the laser produces one Q - switching pulse, a Q - switch pulse width 10ns and a single pulse energy is 3.42mJ. In the Q- switch experiment, the Q- switch pulse is brewaged and end- pulse is growed . This phenomena and the experiment results were analyzed and discussed.