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为改善焦斑的均匀性以应用于惯性约束聚变(ICF)的实验,从焦斑形态的控制出发,在随机相位板(RPP)和连续相位板(CPP)做空域整形下,用同样带宽和最大谱色散角,模拟了不同光谱形状的匀滑效果,通过焦斑强度的功率谱密度(PSD)和平顶的均方根(RMS)对获得的焦斑进行评价.结果表明,改善光谱形状可以提高匀滑效率,优化光谱相对主流的正弦调频光谱对匀滑效果的均方根值可提高43.7%.同时,设计相位板时考虑焦斑上不同空间频率的权重,有利于匀滑.
In order to improve the uniformity of the focal spot and apply it to the experiments of inertial confinement fusion (ICF), from the control of the focal spot morphology, under the condition of space-domain shaping of random phase plate (RPP) and continuous phase plate (CPP) The maximum spectral dispersion angle was used to simulate the smoothing effect of different spectral shapes and the focal spot obtained was evaluated by the power spectral density (PSD) of the focal spot intensity and the root mean square (RMS) of the flattened peak. The results show that improving the spectral shape can Improve the smoothing efficiency, optimize the spectral relative to the mainstream sinusoidal FM spectrum smoothing effect of the root mean square value can be increased 43.7%. At the same time, the design of the phase plate to consider the focal spot of different spatial frequencies of the weight is conducive to smoothing.