中国激光, 2009, 36 (9): 2262, 网络出版: 2009-10-09   

11.8 W高效率掺氧化镁的周期极化铌酸锂晶体光参量振荡2.7 μm激光器

High Efficiency Periodically Poled Lithium Niobate with MgO Optical Parametric Oscillator 2.7 μm Laser with 11.8 W Output Power
作者单位
中国工程物理研究院应用电子学研究所,四川 绵阳 621900
摘要
报道了采用1064 nm激光椭圆光斑抽运掺氧化镁的周期极化铌酸锂(PPMgLN)晶体准相位匹配(QPM)技术实现2.7 μm激光输出的实验结果,理论计算了PPMgLN晶体准相位匹配周期调谐曲线,得出PPMgLN晶体周期为31.3 μm时可获得中红外波长2.7 μm激光输出。PPMgLN晶体(MgO掺杂摩尔分数为5%)单谐振光参量振荡(OPO)技术采用e→e+e相位匹配,消除了光束之间的走离效应和利用了PPMgLN晶体的最大非线性系数d33(27.4 pm/V)。在1064 nm激光抽运功率78 W,声光Q开关工作频率8 kHz的条件下,获得了平均功率11.8 W,波长2.72 μm的激光输出,斜率效率19.5%,对应闲频波长1.75 μm激光输出功率约24 W。2.7 μm激光水平方向和垂直方向光束质量M2因子分别为2.04和5.56。
Abstract
The experimental results of high-efficiency 2.7 μm laser are demonstrated on quasi-phase-matched single-resonated optical parametric oscillator(OPO) in periodically poled lithium niobate with MgO(PPMgLN) pumped by 1064 nm laser of elliptical beam. Theoretical analyses of PPMgLN grating period tuning is presented. When grating period is 31.3 μm, a PPMgLN OPO could get output at wavelength of 2.7 μm. The pump beam polarization matches the e→e+e interaction in PPMgLN (5 mol% MgO-doping), thus maximal nonlinear coefficient d33(27.4 pm/V) is effective and walk-off of beams can be avoided. When pump power was 78 W with 8 kHz Q-switch, an average output power of 11.8 W at 2.72 μm was obtained with slope efficiency of 19.5%, with 24 W at the corresponding idle wavelength of 1.75 μm. The M2 factor of 2.7 μm laser was 2.04, 5.56 in parellel and perpendicular direction respectively.

彭跃峰, 谢刚, 王卫民, 武德勇. 11.8 W高效率掺氧化镁的周期极化铌酸锂晶体光参量振荡2.7 μm激光器[J]. 中国激光, 2009, 36(9): 2262. Peng Yuefeng, Xie Gang, Wang Weimin, Wu Deyong. High Efficiency Periodically Poled Lithium Niobate with MgO Optical Parametric Oscillator 2.7 μm Laser with 11.8 W Output Power[J]. Chinese Journal of Lasers, 2009, 36(9): 2262.

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