垂直腔面发射激光器抽运小型宽温Nd∶YAG激光器及掠入射式放大器的研究  

VCSEL Pumped Compact Wide-Temperature Nd∶YAG Laser and Grazing-Incidence Amplifier

作　　者：于真真[1,2] 侯霞[1] 周群立[1] 周翠芸[1,2] 王志君[1] 杨燕[1] 朱韧[1] 陈卫标[1] 

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2013年第6期46-52,共7页Chinese Journal of Lasers

摘　　要：报道了一种小型宽温Nd∶YAG激光器及掠入射式放大器。采用Nd∶YAG类光纤晶体作为增益介质,采用垂直腔面发射半导体激光器(VCSEL)阵列作为抽运源,利用Cr4+∶YAG作为可饱和吸收体进行被动调Q。连续运转时,在最大有效抽运功率为5.47W时,获得1.808W的输出,光-光转换效率为33.05%,斜率效率为36.5%。调Q模式下得到最窄脉宽为7.5ns、单脉冲能量为87.1μJ、峰值功率为11.6kW的输出。采用掠入射式双程放大模块,对脉冲抽运下得到的单脉冲能量为81μJ、脉宽为13ns的信号光进行放大,在最大抽运功率下,放大后的单脉冲能量为0.88mJ,相应的增益为10.86,能量提取效率为19.44%。放大后两个方向的光束质量因子由M2x=1.175和My2=1.248变为M2x=1.196和My2=1.307。激光器体积紧凑,可采取风冷等措施进行散热,在23±8℃的范围内,输出能量波动小于3%。A compact and wide-temperature Nd： YAG laser and grazing-incidence amplifier are reported. Fiber-like Nd：YAG crystal is used as gain medium and a vertical-cavity surface-emitting laser array（VCSEL） is used for the pump source. Cr4＋ ：YAG is used for passive Q-switch. In continuous-wave （CW） mode, a maximum output power of 1. 808 W is achieved at the highest attainable absorbed pumping power of 5.47 W with an optical-optical conversion efficiency of 33.05 % and the slope efficiency of 36.5 %. In Q-switched mode, pulse with the shortest pulse width of 7.5 ns, single pulse energy of 87.1μJ and peak power of 11.6 kW is obtained. Grazing incidence and double-passes amplification of laser with single pulse energy of 81μJ and pulse width of 13 ns obtained by pulse-pump is investigated. With the maximum pumping power, the pulse energy of 0.88 mJ is obtained with the gain of 10.86 and the energy extraction efficiency of 19.44%. After amplification, beam quality turns into Mx^2 = 1. 196 andMx^2= 1. 307 from Mx^2= 1. 175 and Mx^2= 1. 248. This laser system is compact and air-cooled. The fluctuation of output energy is below 3% when the temperature ranges from 15 ℃ to 31 ℃.

关 键 词：激光器 类光纤晶体 垂直腔面发射半导体激光器阵列 掠入射 多程放大 

分 类 号：TN248.1[电子电信—物理电子学]