基于LAS-CAD软件,设计并优化出结构紧凑的激光二极管(LD)双端抽运声光调Q Nd:YVO4激光器。采用双凹折叠腔结构,808 nm光纤耦合输出LD双端面抽运Nd:YVO4激光晶体,腔长185 mm,耦合输出镜透射率为15%。在44 W抽运功率时,连续激光最高输出功率达到18.6 W,光-光转换效率为42.3%,斜率效率为47.8%,M2 因子约为1.5。在重复频率为100 kHz时,LD抽运功率为41 W,获得激光最大平均功率输出为11.3 W,光-光转换效率约为27.6%,相应单脉冲能量约为113 μJ,脉冲半峰全宽(FWHM)为25 ns,峰值功率为4.52 kW。

According to LAS-CAD software,a compact laser diode (LD) dual-end-pumped acousto-optic Q-switched Nd:YVO4 laser is designed and optimized. In the experiment,an 808 nm fiber-coupled system and double concave face mirror folded cavity are adopted. The length of resonance cavity is 185 mm and the transmission of output coupler is 15%. A TEM00 mode output of 18.6 W is obtained under the condition of continuous waves (CW) at a pump power of 44 W,resulting in an optical conversion efficiency of 42.3%,and a slope efficiency of 47.8%,and M2 of 1.5. An 11.3 W of 1064 nm average power at a repetition rate of 100 kHz is generated with a 41 W LD as pump source,and an optical-to-optical conversion efficiency of 27.6% is obtained. The steady operation is achieved with pulse width of 25 ns,peak power of 4.52 kW and single pulse energy of 113 μJ at the repetition rate.