为了实现3.8μm激光输出, 采用了1.064μm激光抽运周期性极化掺氧化镁铌酸锂晶体（MgO掺杂摩尔分数为0.05）的光参变振荡器技术,由理论分析得到1.064μm激光抽运PPMgLN实现激光输出时, 输出波长与极化周期以及温度的关系曲线。实验中, 当晶体周期为29.2μm、温度为400K时, 实现了3.8μm激光输出; 当抽运功率为35W、声光调Q频率为8kHz条件下, 获得3.84μm激光输出的平均功率为3.9W, 其转换效率为11.14%, 激光光束质量为6.46。结果表明, 该技术可以获得较高转换效率的3.8μm激光输出, 有望成为中红外激光对抗的激光干扰源。

In order to obtain 3.8μm laser output, it was demonstrated in optical parametric oscillator（OPO）with periodically poled lithium niobate crystals doped with magnesium oxide (mole fraction of MgO-doping is 0.05) pumped by 1.064μm laser. The relationship curve between output wavelength and polarization period and the temperature was calculated. When polarization period is 29.2μm and the temperature is 400K, 3.8μm laser output is achieved. When pump power is 35W at repetition rate of 8kHz, an average output power of 3.9W at 3.84μm is obtained with slope efficiency of 11.14%, and the M2 factor is 6.46. The results show that 3.8μm laser output can be obtained with high conversion efficiency, and it can be used as laser sources of infrared laser interference.