光纤激光器泵浦光参量振荡器

Study on fiber laser pumped optical parametric oscillator

为了获得小体积高功率3～5μm中红外激光输出，通过高重复频率驱动调Q技术和种子注入光放大技术，获得高功率高光束质量1.06μm光纤激光输出，外置起偏器获得两束激光输出，利用波片偏振旋光原理，实现两束偏振态一致的激光输出，泵浦非线性晶体PPLN进行频率变换，实现高功率3～5μm中红外激光输出。在电源输入电流60 A，调Q驱动频率50 kHz 的条件下，获得最高功率6.2 W的3.8μm中红外激光，1.06μm到3.8μm转化效率为16％。实验结果表明：通过光纤激光器泵浦光参量振荡器，可获得高功率3.8μm中红外激光输出。

To acquire small volume and high power mid-IR laser,1.06 μm high power and high beam quality fiber la-ser output is obtained by using high repetition frequency driving Q-switched synchronization technology and seed in-jection magnify technology.The outputs of two beam laser are obtained in exterior polarizer,and plates polarized opti-cal principle is adopted to acquire laser outputs of two beam polarizer identity,PPLN is pumped to obtain high power 3~5 μm Mid-IR laser output.As the input current is 60 A and the Q-switched frequency is 50 kHz ,the max power of 3.8 μm laser output is 6.2W,1.06 μm to 3.8 μm conversion efficiency is 1 6%.Experiment results indicate that fiber laser pumped optical parametric oscillator can be used to obtain 3.8 μm high power Mid-IR laser output.