梯度补偿法控温晶体的高功率绿光激光器  

Grads-Compensating Temperature Control for Crystal in High Power Green Light Laser

作　　者：赵智亮[1] 朱健强[1] 陈立华[2] 王勇[1] 王宪涛[1] 崔俊文[1] 李永春[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2007年第5期623-627,共5页Chinese Journal of Lasers

摘　　要：研究了平均功率超过30W的稳定高效全固态绿光激光器,分析得出影响全固态腔内倍频激光器倍频效率和输出稳定性的主要因素是倍频晶体局部温升造成的相位失配和热透镜效应,采用温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,降低激光器工作中倍频晶体内外温度梯度从而有效地克服因晶体局部温升造成的倍频相位匹配角失配和热透镜效应。采用三条60W的半导体激光二极管阵列板条侧面抽运Nd:YAG激光增益介质棒,采用声光调Q,平凹直腔和腔内倍频结构配合温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,得到了稳定高效的532nm绿光输出。在抽运电流25A,抽运功率174.6W时,得到了脉冲宽度110ns,重复频率10kHz,输出平均功率31.6W稳定高效的绿光输出,光-光转换效率为18.1%,功率稳定性为±0.66%,绿光输出光束质量因子M2=4.3。A stable and efficient all solid-state green laser with average power over 30 W is studied. The phase mismatching and thermal lens effect induced by local temperature rise of doubling frequency crystal are the major reasons affecting frequency doubling efficiency and laser output power stability. The method of grads-compensating temperature controll is used to adjust the operating temperature of frequency doubling crystal with large size. This temperature control system debases the inside and outside temperature grads of crystal to compensate the phase mismatching and thermal lens effect of frequency doubling crystal. This laser that is side-pumped by three bars laser diode array of 60 W and adopts the high efficiency flat-concave cavity, intracavity frequency doubling resonance structure, and acoust-optic Q-switching generates a maximum green average power of 31.6 W with 110 ns pulse width and 10 kHz repetition rate when pumped current of laser diode was 25 A and pumped power was 174.6 W. The optic-optic transition efficiency is up to 18.1 %, and power stability is up to ±0.66 % with beam quality factor of green laser M^2= 4.3.

关 键 词：激光技术 Nd∶YAG激光器 倍频晶体 梯度补偿控温 腔内倍频 532nm绿光 

分 类 号：TN248.1[电子电信—物理电子学]