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介绍了一种减少半导体激光器阵列光栅外腔光谱合束(SBC)整体光谱展宽的方法,通过加入一组变形棱镜对传统光谱合束结构进行了改善。变形棱镜的作用实现减小半导体激光线阵输出光斑宽度,减小入射到光栅上的入射角度进而减小整体的光谱线宽。采用发光单元宽度为100μm、周期为500μm、由19个发光单元组成的常规CM-Bar条进行光栅-外腔光谱合束技术的理论推导及软件模拟,得到了光谱线宽为3.2nm。与通过增大柱透镜焦距来减小光谱线宽的方法相比,此方法的优势是保证了整体光谱合束的整体结构在500mm以内,使得各个发光单元有足够反馈量,抑制光束间串扰,保证合束后的光束质量和效率。
A method to reduce the overall spectral broadening of the SBC of a semiconductor laser array grating is introduced. The traditional spectral combination structure is improved by adding a set of deformable prisms. The effect of the deformable prism reduces the width of the output light spot of the semiconductor laser array, reduces the incident angle on the grating, and reduces the overall spectral line width. The theoretical derivation and software simulation of grating - external cavity spectroscopy combined with the conventional CM-Bar with a width of 100μm and a period of 500μm consisting of 19 light emitting units were carried out. The spectral linewidth was 3.2nm. Compared with the method of reducing the spectral line width by increasing the focal length of the cylindrical lens, the advantage of this method is to ensure that the overall structure of the overall spectral combination beam is within 500 mm, so that each of the light emitting units has enough feedback amount to suppress crosstalk between beams, Ensure beam quality and efficiency after beam combination.