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报道了使用MgO掺杂摩尔分数为5%的周期性极化铌酸锂晶体(PPMgLN)的高重复频率、低阈值的2μm激光器。理论计算了1.064μm激光抽运PPMgLN时,极化周期与温度的对应关系。实验对比了双极化周期PPMgLN晶体(极化周期分别为32.2μm和32μm)的转换效率。重点对转换效率较高的极化周期(32μm)进行了振荡阈值的实验分析。在满足转换效率不低于40%的前提下,实现了振荡阈值为0.046MW/cm2、近简并波长(信号光波长2.05μm、闲频光波长2.236μm)的激光输出。
Reported a high repetition rate, low-threshold 2 μm laser using periodically poled lithium niobate crystals (PPMgLN) doped with MgO at a mole fraction of 5%. The corresponding relationship between the polarization period and temperature is theoretically calculated when the 1.064μm laser pumped PPMgLN is used. The experimental results show that the conversion efficiency of the PPMgLN with dual polarization is 32.2μm and 32μm respectively. Emphasis on the conversion efficiency of the polarization cycle (32μm) conducted an experimental analysis of the oscillation threshold. Under the premise of meeting the conversion efficiency of not less than 40%, the laser output with the oscillation threshold of 0.046MW / cm2 and near degenerate wavelength (signal light wavelength 2.05μm and idler wavelength 2.236μm) was achieved.