采用激光二极管作为抽运源、大模面积Er3+/Yb3+ 共掺双包层光纤作为增益介质，利用闪耀光栅、傅里叶变换透镜和输出耦合镜构成外腔，进行了光纤激光器的外腔谱组束实验研究。在外腔作用下，单个光纤激光器可在38 nm波长范围内实现调谐输出，线宽小于0.08 nm。实现了三路光纤激光器的外腔谱组束，组束功率为940 mW，相应的组束效率为74.3%；水平方向光束质量因子M2x=1.320，与单束激光输出（M2x=1.204）相比略微增大；当换用较长焦距的傅里叶变换透镜时，系统组束潜力增大且光束质量得到改善。

The external cavity-based spectral beam combining of Er3+/Yb3+ codoped fiber lasers is studied experimentally by using laser diodes as pump sources and large-mode-area Er3+/Yb3+ codoped double-clad fiber lasers as the gain media. The external cavity is composed of a blazed grating, a Fourier transform lens and an output coupling mirror. With the external cavity, single fiber laser can produce wavelength-tunable output. The tunable range is 38 nm and the linewidth is less than 0.08 nm. Spectral beam combining of three fiber lasers is performed. The combined output power is 940 mW with the combining efficiency of 74.3%. The output beam profile is stable with good beam quality and the beam quality factor M2x in the horizontal direction is 1.320, slightly higher than that of individual laser output which is 1.204. When using Fourier transform lens with longer focal length, the combining potential of the system can be increased and the beam quality can be improved.