报道了利用放置在外腔中的闪耀光栅实现两个不同长度Er³⁺/Yb³⁺共掺双包层光纤(EYDF)激光器谱组束的实验。外腔由两个二色镜和一个共用的部分反射镜构成,增益介质为EYDF,外腔中的变换透镜可将光纤输出端按角度定位到闪耀光栅上,闪耀光栅实现光纤激光器的模式选择。实验进行了单个EYDF激光器的调谐,在1532-1568 nm范围内获得了稳定的单模输出,激光3 dB线宽均小于0.08 nm,调谐范围约为36 nm,接近Er³⁺的增益带宽。实现了两根长度分别为6 m和8 m的EYDF激光器的谱组束,在入纤抽运功率分别为2.6 W和4 W的条件下,获得了480 mW的谱组束输出。

Spectral beam combination of two Er³⁺/Yb³⁺ co-doped double-clad fiber (EYDF) lasers were experimentally studied through an outer resonator with a blazed grating placed in it. The outer resonator was formed by two dichroic mirrors and a partial reflector. Two EYDFs with different lengths were used as the gain element. A transform lens were employed to locate the output ends of the EYDFs in term of their incidence angle on surface of the blazed grating. The blazed grating was used to select the operating modes of the two EYDF lasers. The wavelength characteristics of a single EYDF laser were tuned experimentally. Stable output of single mode laser was achieved from 1532 nm to 1568 nm. The tunable range was about 36 nm and the 3 dB line width of the output lasers were all less then 0.08 nm. The output powers of the two EYDFs with lengths of 6 m and 8 m respectively were spectrally combined together. The combined output power of 480 mW was achieved on condition that the maximum pump powers coupled into the two fibers were 2.6 W and 4 W,respectively.