1.9 ns LD端面泵浦Nd:YVO4/GaAs被动调Q激光器

研究了激光二极管端面泵浦Nd:YVO4/GaAs被动调Q激光器的输出特性。在连续光运转和调Q运转情况下，得到的激光最高输出斜效率分别为41.5%和11.4%。用一片700 μm厚的GaAs薄片作为饱和吸收体，对1.06 μm激光透过率为6.5%的平面镜作为15 mm谐振腔的耦合输出镜，得到的最短脉宽仅为1.9 ns。在泵浦功率由0.5 W上升到5.6 W的过程中，用T为6.5%和20%的输出镜得到的脉冲重复频率从18.7和23.9 kHz分别上升到53和41.3 kHz。两种输出镜透过率下得到的最大脉冲能量分别为8.5和13.3 μJ，相应的峰值功率高达4.45和4.6 kW。此激光器具有非常高的振幅稳定性，在高泵浦功率下调Q脉冲振幅波动小于3%。

1.9 ns LD-end-pumped passively Q-switched Nd:YVO4 laser with GaAs

We addressed the output properties of adiode end pumped Nd:YVO4/GaAs laser passively Q switched with GaAs saturable absorber.The maximum output slope efficiencies of the continuous wave (CW)and Q switching operation were 41.5% and 11.4%. We obtained the shortest pulse width of only 1.9 ns with a 700μm thick GaAs wafer as a satuable absorber and a plane mirror of T=6.5% as a output coupler (OC) of a 15 mm long laser cavity. Pulse repetition frequency acquired by T=6.5% and T=20% OCs respectively increased from 18.7 and 23.9 kHz to 53 and 41.3 kHz in the increasing process of absorbed pumping power from 0.5 to 5.6 W. The biggest pulse energy obtained through these two OCs was 8.5 and 13.3 μJ, whose peak powers were 4.45 and 4.6 kW. This Q switched Nd:YVO4/GaAs laser had very high amplitude stability, whose Q switched pulse amplitude fluctuation was less than 3% for high pump power.