PPMgLN用于光参量振荡实现低阈值2 μm激光

邓华荣; 张龙; 谢宇宙; 李彤; 李燕凌; 薛亮平

doi:doi:10.3788/cjl201340.0702014

中国激光, 2013, 40 (7): 0702014, 网络出版: 2013-07-01

PPMgLN用于光参量振荡实现低阈值2 μm激光

Low Threshold 2 μm Laser Based on Optical Parametric Oscillator Using PPMgLN

论文大纲

邓华荣 ^*张龙谢宇宙李彤李燕凌薛亮平

作者单位

西南技术物理研究所，四川省成都 610041

非线性光学光参量振荡 2 μm激光器 PPMgLN晶体准相位匹配 nonlinear optics optical parametric oscillator 2 μm laser PPMgLN crystal quasi-phase matching

摘要

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2 μm激光器。理论计算了1.064 μm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32.2 μm和32 μm)的转换效率。重点对转换效率较高的极化周期(32 μm)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0.046 MW/cm2、近简并波长(信号光波长2.05 μm、闲频光波长2.236 μm)的激光输出。

Abstract

High repetition frequency and low threshold laser with wavelength of 2 μm is reported using periodically poled MgO-doped lithium niobate (PPMgLN) with doped concentration of 5%. A 2 μm laser is obtained with PPMgLN pumped by a 1.064 μm laser and the corresponding relation between polarization period and the temperature is calculated. In experiments, the comparison of the efficiencies of two different polarization periods (32.2 μm and 32 μm) is carried on. We focus on the polarization period that has higher efficiency (32 μm) and conduct the experimental analysis of the oscillation threshold. Under the condition of the conversion efficiency is not less than 40%, the laser output with oscillation threshold of 0.046 MW/cm2 at near degenerate point(signal wavelength of 2.05 μm, idler wavelength of 2.236 μm) is achieved.

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邓华荣, 张龙, 谢宇宙, 李彤, 李燕凌, 薛亮平. PPMgLN用于光参量振荡实现低阈值2 μm激光[J]. 中国激光, 2013, 40(7): 0702014. Deng Huarong, Zhang Long, Xie Yuzhou, Li Tong, Li Yanling, Xue Liangping. Low Threshold 2 μm Laser Based on Optical Parametric Oscillator Using PPMgLN[J]. Chinese Journal of Lasers, 2013, 40(7): 0702014.

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