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 ℃.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2013年第6期46-52,共7页
Chinese Journal of Lasers
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
lasers
fiber-like crystal
vertical-cavity surface-emitting laser array
grazing incidence
multi-passamplification
