两个光纤激光器的相位锁定及高相干功率输出  

Phase-Locking and High Coherent Power Output of Two Fiber Lasers

作　　者：何兵[1] 楼祺洪[1] 周军[1] 薛冬[1] 董景星[1] 魏运荣[1] 漆云凤[1] 王之江[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2006年第9期1153-1158,共6页Chinese Journal of Lasers

基　　金：国家863计划(2005AA828030);中国科学院知识创新工程资助项目

摘　　要：研究了两个光纤激光器的相位锁定及其相干输出。将两个光纤激光器的输出耦合进一个自成像共振腔,然后利用一个空间滤波器进行模式选择。自成像共振腔由两个焦距为8 mm的准直透镜、一个焦距为500 mm的傅里叶透镜和一个耦合输出镜组成。滤波器由两根20μm的铂金线组成,并放置在耦合输出镜面上。实验中,观测到光束截面图样具有高对比度的干涉条纹。输出镜反射率在50%和30%情况下,分析了单个激光器和激光器阵列的斜率效率。在总抽运功率为60 W时,获得了18.3 W的高相干功率输出。稳定的相位锁定是由于激光器阵列具有能适应光程长度变化的自调节过程。实验表明,利用该方法完全可以进一步提高相干输出功率。Phase-locking and coherent output of two fiber lasers are studied. Two fiber laser are coupled into a common self-imaging resonator with a spatial filter for mode selection. The resonator consists of two collimators with 8 mm focal length, a Fourier lens with 500 mm focal length, and a coupled output mirror. The filter is made of two platinum wires with 20 μm diameter and is placed at the plane of the output mirror. The high-contrast interference strips of the beam profile are observed. Under the output mirrcr with the different reflectivity of 50 and 30% condition, the slope efficiencies of the individual laser and the laser array are analyzed. When the whole pump power is 60 W, a high coherent power output of 18.3 W is obtained. Steady phase-locking results from a self adjusting process of the laser array which adapts to changes in the optical path lengths. This experiment shows that the coherent power output can be improved greatly by means of this method.

关 键 词：激光器 相位锁定 自成像共振腔 空间滤波器 

分 类 号：TN248.1[电子电信—物理电子学] O436.1[机械工程—光学工程]