光栅角色散和制作误差对谱合成光束特性的影响
Effects of angle dispersion and fabrication errors of gratings on beam characteristics of spectral combining systems
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摘要: 考虑光束的发散、光栅角色散以及光栅制作过程中存在的刻槽倾角误差，应用光线追迹方法，建立了激光束入射到光栅时相位变化的计算模型。利用衍射积分方法和光束非相干叠加原理，推导出阵列光源各子光束经谱合成系统后合成光束的光强分布解析表达式。在此基础上，利用强度二阶矩方法，计算了合成光束的M2因子，并定量分析了光栅角色散和光栅刻槽倾角误差对谱合成光束特性的影响。研究结果表明:光栅角色散和光栅刻槽倾角误差的存在均会导致谱合成光束的光束质量变差，光栅刻槽倾角误差的影响比光栅角色散的影响更为明显。Abstract: Considering the beam divergence ,the angle dispersion and the fabrication errors of groove angle of the grating and using ray tracing method, the calculation model for the phase change of the laser beam obliquely incident on the grating has been built up. Then, making use of the diffraction integral method and the principle of incoherent superposition of laser beams, the analytical expression for the output intensity distribution of each emitter after passing through the spectral beam combining system has been derived. Finally, according to the intensity second-order moments method, the M2-factor of the combined beam has been calculated and the efffects of the angle dispersion and the fabrication errors of grating groove angle on the beam characterristics of the spectral combining system h
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