论文部分内容阅读
报道了采用1064 nm激光抽运PPMgLN晶体准相位匹配(QPM)技术实现高效率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31.3μm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并利用了PPMgLN晶体的最大非线性系数d33(27.4 pm/V)。在1064 nm激光抽运功率为26 W,声光Q开关工作频率为7 kHz的条件下,获得平均功率为4.7 W,波长为2.72μm激光输出,斜率效率超过21%,对应闲频光波长1.75 μm激光输出功率约9 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2.05和1.84。
The experimental results of a high efficiency 2.7μm laser output using a 1064 nm laser pumped PPMgLN crystal quasi-phase matching (QPM) technique are reported. The theoretical tuning of the quasi-phase matching period tuning curve of the PPMgLN crystal shows that when the period of the PPMgLN crystal is 31.3μm Get mid-infrared wavelength 2.7μm laser output. The single resonance optical parametric oscillation (OPO) technique of PPMgLN crystal (5% MgO doping mole fraction) adopts e → e + e phase matching to eliminate the effect of the light-to-the-band separation and to utilize the maximum nonlinear coefficient d33 of PPMgLN crystal (27.4 pm / V). Under the conditions of 1064 nm laser pumping power of 26 W and acousto-optic Q switching operating frequency of 7 kHz, the average power is 4.7 W and the wavelength is 2.72 μm laser output, the slope efficiency exceeds 21%, corresponding to idler wavelength 1.75 μm laser output power of about 9 W. The M2 quality of the 2.7 μm laser beam in the horizontal and vertical directions was 2.05 and 1.84, respectively.