报道了外腔2个大模面积双包层Er3+/Yb3+共掺光纤激光器频谱组束的实验结果,获得了最大功率为0.80 W、组束效率高达82.5%的组束激光输出。演示和分析了光纤末端放置位置的改变、光栅的旋转对输出光谱和组束效率的影响,结果表明:当光纤末端距系统轴的位置超过某一定值时,输出光谱呈现多模;当光栅与水平面所成角度减小时,组束效率逐渐增大。

Experimental results of spectral beam combining for two fiber lasers in an external cavity have been reported,which used large-mode-area Er3+/Yb3+ co-doped double-cladding fiber as the gain medium. The maximal output power of 0.80 W with combining efficiency more than 82.5% was obtained. The effect of changing fiber-end distance from the system axis,as well as rotation of the grating on spectral output and combining efficiency was demonstrated and analyzed,which shows that one of the spectra is multimoded when the distance of fiber end from the system axis is beyond a certain range,and combining efficiency increases when the angle of the grating decreases with respect to horizontal plane.