准相位匹配PPMgLN光参量振荡技术
Quasi-phase-matched optical parametric oscillator based on PPMgLN
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摘要: 理论上分析了PPMgLN光参量振荡波长调谐特性，计算了泵浦阈值和转换效率。准相位匹配情况下，周期调谐是获得中红外波长调谐有效方法之一。采用高斯光束泵浦，当泵浦功率密度超过阈值泵浦功率密度约6.5倍时，可以获得最高转换效率，约71%。采用1 064 nm激光泵浦多周期PPMgLN晶体，实验上获得了波长调谐范围2.7~4.8 mm，当泵浦功率为8 W时，在波长3.7 mm处激光输出功率超过1.6 W，斜效率超过20%，相应的转换效率约为69%，与理论分析基本一致。Abstract: Theoretical and experimental study is presented on grating period-tuned single-resonated quasi-phase-matched optical parametric oscillator in multi-grating periodically poled MgO-doped lithium niobate(PPMgLN) pumped by 1 064 nm laser. Theoretical analyses include grating period tuning, pump threshold and converting efficiency of PPMgLN SRO. The pump source is a acousto-optically Q-switched CW- diode- side- pumped Nd:YAG laser. The pump beam polarization matches the e→e+e interaction in PPMgLN, thus the maximum nonlinear coefficient (27.4 pm/V) is effective. When pump power is 8 W, an average output power of more than 1.6 W at 3.7 mm is obtained with a corresponding slope efficiency of more than 20%, and a tunable mid-infrared wavelength output from 2.7 to 4.8 mm is also obtained by gratin
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