11.2W中红外3.8μm激光器

3.8 μm mid-infrared laser with 11.2 W output power

报道了采用1064nm激光抽运PPMgLN晶体准相位匹配技术实现3.8μm激光输出的实验结果。抽运源为二极管激光连续抽运Nd:YAG晶体声光调Q1μm激光器,PPMgLN晶体(MgO掺杂浓度5mol%)单谐振光参量振荡技术采用e→e+e相位匹配,消除了光束之间的走离效应,利用了PPMgLN晶体的最大非线性系数d33(27.4pm/V)。在1064nm激光抽运功率94W,声光Q开关工作频率8kHz的条件下,获得了平均功率11.2W,波长3.84μm激光输出,光-光转换斜率效率14.5%,对应闲频波长1.47μm激光输出功率约28W。3.8μm激光水平方向和垂直方向光束质量M2因子分别为2.01和5.78。

The experimental results of high-efficiency 3.8 μm laser is demonstrated on quasi-phase-matched single-resonated optical parametric oscillator(OPO) in PPMgLN(5% MgO-doping) pumped by 1 064 nm laser of elliptical beam. The pump source is a acousto-optically Q-switched CW-diode-side-pumped Nd:YAG laser, the pump beam polarization matches the e-ee interaction in PPMgLN, thus maximal nonlinear coefficient d33(27.4 pm/V) is effective and walk-off of beams can be avoided. When pump power was 94 W with repetition ...