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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2.7μm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2.7μm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d_(33)(27.4 pm/V)。在1064 nm激光抽运功率78 W,卢光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2.72μm的激光输出,斜率效率19.5%,对应闲频波长1.75μm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M~2因子分别为2.04和5.56。
The experimental results of a 2.7μm laser output using a quasi-phase-aligned QPM technique with 1064 nm laser elliptical spot-pumped periodic polarization lithium niobate (PPMgLN) crystal were reported. The phase tuning of the PPMgLN crystal was theoretically calculated Curve, obtained PPMgLN crystal period of 31.3 μm can be obtained when the mid-infrared wavelength 2.7μm laser output. The single resonance optical parametric oscillation (OPO) technique of PPMgLN crystal (MgO doped with 5% molar fraction) adopts the e → e + e phase matching to eliminate the effect of the light beam and to utilize the maximum nonlinear coefficient d_ (33) (27.4 pm / V). Laser output power of 11.8 W and wavelength of 2.72 μm was obtained with a laser power of 78 W at 1064 nm and an operating frequency of 8 kHz at Lu Guang Q switch with a slope efficiency of 19.5% About 24 W. The beam quality M ~ 2 of 2.7 μm laser in the horizontal and vertical directions were 2.04 and 5.56, respectively.