高功率中红外3.8 μm激光器
High-power mid-infrared 3.8 μm laser
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摘要: 采用1.06 μm激光泵浦准相位匹配周期极化铌酸锂（PPMgLN）晶体光参量振荡器，实现高功率高效率高重复频率3.84 μm中红外激光输出。泵浦源为椭圆光斑1.06 μm激光，PPMgLN晶体MgO摩尔分数为5%，光参量振荡器为外腔单谐振结构，采用e→e+e相位匹配，利用了PPMgLN晶体的最大非线性系数。在1.06 μm激光功率为73 W，声光Q开关工作频率为7.5 kHz的条件下，获得平均功率8.3 W，波长3.84 μm激光输出，光-光转换斜率效率14.1％，水平和垂直方向光束质量平方因子分别为1.94，4.57。Abstract: A high-average-power high-efficiency high-repetition-rate mid-infrared laser at 3.84 μm was demonstrated.The laser was based on quasi-phase-matched periodically poled LiNbO3(PPMgLN) optical parametric oscillator(OPO),pumped by elliptical 1.06 μm laser beam.The PPMgLN crystal was 5% MgO-doped.The OPO was extra-cavity and single-resonated OPO.The pump beam polarization matched e→e+e interaction in PPMgLN, thus maximal nonlinear coefficient was effective. When pump power was 73 W at acoustic-optic Q-switch repetition rate 7.5 kHz, 8.3 W average output power at 3.84 μm was obtained with slope efficiency 14.1%.The optical beam quality factors were 1.94,4.57 in horizontal and perpendicular direction,respectively.
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Key words:
- laser technique /
- mid-ir laser /
- quasi-phase-matching /
- ppmgln crystal /
- optical parametric oscillator
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