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建立了光束谱合成的传输模型.应用光线追迹方法,将闪耀光栅引起的相位变化用槽间光程差和槽内光程差来表示,建立了光束倾斜入射到光栅时相位变化的计算模型.利用衍射积分方法,给出了阵列光源各子光束经谱合成系统后输出光场的解析表达式.依据光束非相干叠加的原理,计算得到合成光束的光强分布.在此基础上,利用强度二阶矩方法,分别计算了阵列光束和合成光束的M2因子,并定量分析了谱合成系统参数对合成光束特性的影响.研究结果表明:通过谱合成系统合成光束的M2因子与单个子光束的M2因子相近;随着变换透镜焦距的增加,各子光束中心波长的间距减小,从而使合成光束谱宽减小;阵列单元的封装误差对合成光束的光强分布影响相对较小,而整个阵列的对准误差则对合成光束的光强分布存在明显影响.
The transmission model of the beam spectrum synthesis was established.Using ray tracing method, the phase change caused by the blazed grating was expressed by the optical path difference between the grooves and the optical path difference within the groove, and the calculation model of the phase change when the light beam was incident on the grating Based on the diffraction integral method, the analytical expression of the output light field of each sub-beam of the array light source after spectral synthesis is given. Based on the principle of non-coherent beam addition, the light intensity distribution of the synthesized beam is calculated. On this basis, Intensity M2 moment method, the M2 factor of the array beam and the composite beam were calculated respectively, and the influence of the parameters of the spectral synthesis system on the characteristics of the synthesized beam was quantitatively analyzed.The results show that the M2 factor of the synthesized beam by the spectral synthesis system and the single sub- With the increase of the focal length of the conversion lens, the spacing of the center wavelength of each sub-beam decreases, so that the spectral width of the composite beam decreases; the package error of the array unit has a relatively small influence on the light intensity distribution of the composite beam The alignment error of the entire array has a significant effect on the light intensity distribution of the composite beam.