热退偏损耗完全补偿的千赫兹电光调Q Nd:YAG激光器

为了同时补偿固体增益介质的热致双折射及热透镜效应,进一步提高重复频率1 kHz激光二极管(LD)侧向抽运高平均功率电光调QNd∶YAG激光器的输出功率,设计了一种完全消除热退偏损耗的双调Q开关谐振腔结构,此结构在传统调Q谐振腔的基础上沿着偏振片的退偏方向增加了一个调Q谐振支路,并使得激光从增益介质方向输出.实验结果表明,此激光器的单脉冲能量比单Q开关结构的非补偿腔输出能量高出74.7%.当侧面抽运的激光二极管输出脉冲能量达到307 mJ时,激光输出能量达到26.2 mJ,光-光转换效率为8.5%,光束发散角为1 mrad.

1 kHz Electro-Optic Q-Switched Nd: YAG Laser with Complete Compensation of Thermally Induced Depolarization Loss

A double Q-switcher-structured resonator that can completely compensate the thermally induced depolarization loss is designed to compensate thermally induced birefringence and thermal lens effect of solid gain medium to get higher output power from a 1 kHz laser diode (LD) side-pumped electro-optic Q-switched Nd:YAG laser. We add a resonator branch along the way of the depolarization direction of the polarizer on the base of a conventional Q-switch uncompensated structure laser and the output is from the Nd:YAG crystal side. The experimental results show that, in the same situation, the pulse energy of the improved laser is 74.7% higher than that of original one. At a highest input energy of 307 mJ, the pulse energy of 26.2 mJ is obtained. The optic-optic efficiency is 8.5% and the angle of divergence is about 1 mrad.