光栅-外腔光谱合束是基于光栅的波长选择特性和外腔的反馈，使得半导体激光阵列(DLA)中的每个发光单元锁定在不同的波长，并保持每个发光单元输出光束在近场和远场重合，实现光谱合束后输出光束质量与单个发光单元的光束质量保持一致，极大地改善了输出光束的光束质量。实验采用发光单元宽度为100 μm 、周期为500 μm ，由19 个发光单元组成的常规CM-Bar 条进行光栅-外腔光谱合束技术实验，在连续运行最大注入电流为70 A，获得了44.9 W 的连续激光输出，快慢轴的光束质量分别为1.52 mm·mrad和5 mm·mrad，合束后的电光转换效率为36%，输出光斑亮度约为36.92 MW/cm2-str，光谱展宽为3.24 nm，合成输出激光可以被耦合进入50 μm 芯径、数值孔径(NA) 0.22的光纤中，作为高亮度激光抽运源或直接半导体激光光源使用。

The grating-external cavity spectral beam combined is based on the wavelength selection characteristic of the grating and the feedback by external cavity and simultaneously controls each emitter of the diode laser array (DLA) to lock at different wavelengths, while forces the individual beam to overlap in the near and far fields. The spectral combined beam has the same beam quality as the beam of single emitter of the DLA, greatly improve the beam quality of the output beam. The conventional CM-Bar with 19 emitters is applied, The period of the CM-Bar is 500 μm and the width of emitter is 100 μm . With the maximum continuous wave (CW) injection current of 70 A, a continuous 44.90 W laser output is obtained. The beam quality of slow and fast axes after spectral beam combined are 1.52 mm·mrad and 5 mm·mrad, respectively. Electro-optic conversion efficiency of 36% is achieved. The brightness of output spot is about 36.92 MW/cm2-str, spectral widening is 3.24 nm, combining output laser coupled into 50 μm core diameter, numerical aperture (NA) of 0.22 fiber, can be used as a high-brightness laser pump source or direct diode laser source.