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用数值方法研究了激光驱动器系统中使用光谱色散平滑单元后光束的衍射特性.模拟结果表明,光谱色散会使光束衍射光斑变大,近场空间强度均匀性改善,而远场光斑内部存在光强接近于均匀分布的区域.进一步分析了光谱色散平滑单元中相位调制器的调制深度、调制频率及光栅色散系数等主要元件参数对光束传输特性的影响,发现在一定情况下光斑内部会出现较强的强度调制.
The diffraction characteristics of the beam after the spectral dispersion smoothing unit in a laser driver system are studied numerically. The simulation results show that the spectral dispersion will increase the diffraction spot of the beam and improve the spatial uniformity of the near-field light intensity while the intensity of the light in the far-field spot Close to the uniform distribution region.Further analysis of the spectral dispersion smoothing unit modulation depth of the phase modulator, modulation frequency and grating dispersion coefficient of the main components such as the impact on the transmission characteristics of the beam, found that under certain circumstances the spot will appear stronger The intensity modulation.