光纤激光泵浦周期极化晶体双波段激光器

Fiber laser pumped periodically poled crystal dual-band laser

针对激光定向干扰系统要求对抗1μm^3μm和3μm^5μm 2种类型探测器,需要输出相应2种波段激光,通过高重频调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2束激光输出,分别为泵浦周期极化钽酸锂和周期极化铌酸锂晶体,实现高功率1μm^3μm和3μm^5μm激光输出。在电源输入电流60A,调Q驱动频率50kHz的条件下,获得最高功率7.5 W的2μm激光和4.2 W的3.9μm激光,频率转换效率为39.5%。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1μm^3μm和3μm^5μm双波段激光输出。

Aiming at the laser directed interference system ,which counteracts two kinds of de‐tectors of 1 μm^3 μm and 3 μm^5 μm ,needing two corresponding wavebands outputs ,we used the high repetition rate driving Q‐switched technology and the seed injection magnifying technology to acquire high‐power good‐quality 1 .06 μm fiber laser output ,the exterior polariz‐er got two beams laser outputs ,the periodically poled lithium tantalate (PPLT) and periodical‐ly poled lithium niobate (PPLN ) crystals were pumped to get high‐power 1 μm ~3 μm and 3 μm^5 μm laser outputs .As the input current was 60A and the Q‐switched frequency was 50 kHz ,the 2 μm laser output was obtained with up to 7 .5 W power as well as the 3 .9 μm laser with a 4 .2 W max power ,the conversion efficiency was 39 .5% .Experiment results indi‐cate that using the fiber laser pumped optical parametric oscillator(OPO) ,the high power 1~3 μm and 3~5 μm dual‐band laser output can be got .