半导体激光器由于受波导结构和芯片封装等因素的限制，其快慢轴方向上的光束质量差距较大，主要用作抽运源，即被当成亮度转换器使用，很难作为高亮度光源直接应用。介绍了提高输出光功率密度和输出光束质量的非相干合束技术——光栅外腔反馈光谱合束技术，以及近几年来的国内外的发展现状，梳理了半导体激光器外腔光谱合束技术发展的若干重要动向，为以后半导体激光器光谱合束技术的发展提供了参考。

Due to the limitations of packaging, waveguide structure and other factors inducing the asymmetrical beam quality on fast and slow axis, diode laser is usually used as pump source and power convertor, it is difficult for diode laser to be used as a high- brightness laser source directly. The development of an incoherent beam combining technology-external cavity feedback grating spectral beam combining, which could improve the output optical power density and output beam quality of semiconductor laser, is introduced. A number of important trends in the development of semiconductor laser spectral beam combining technology are summatised, which provides a reference for future development of semiconductor laser spectral beam combining technology.