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提出将空间域的透镜列阵法和时间域的光谱色散平滑法结合起来实现靶面的均匀辐照.消衍射型透镜列阵能获得边缘陡峭且顶部较平坦的准近场焦斑,光谱色散平滑则能有效地抹平焦斑内部由多光束干涉引起的细密条纹.数值结果显示,通过该方案能获得均匀性较好的焦斑.进一步分析了光谱色散平滑单元中位相调制和光栅的参数对辐照均匀性的影响,发现参数的选取要在焦斑均匀性和能量利用率之间取得合理平衡,以在整体上获得最佳的均匀辐照效果.
It is proposed to combine the spatial array lens array method and the time domain spectral dispersion smoothing method to achieve uniform irradiation of the target surface.The defocus-type lens array can obtain quasi-near-field focal spot with steep edge and flat top, Smoothing effectively smoothes the fine fringes caused by multi-beam interference in the focal spot.The numerical results show that this method can obtain a better uniformity of the focal spot.Further analysis of the parameters of the phase modulation and grating in the spectral dispersion smoothing unit The impact on the uniformity of irradiation, found that the choice of parameters in the focal spot uniformity and energy utilization to achieve a reasonable balance between, in order to obtain the best overall uniform irradiation effect.