Analysis of beam smoothing tolerance ability of continuous phase plate
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摘要: 在惯性约束聚变系统中，改进G-S算法设计的连续相位板能够对波前发生畸变的激光进行束匀滑处理，以改善远场分布。由于连续相位板对不同畸变状态的波前进行处理后的效果不一样，因此针对连续相位板的束匀滑容差能力进行了系统分析。鉴于畸变光束的传输特性，采用波前均方根梯度来量化波前畸变量，定量计算了不同畸变光经过匀滑处理后的远场光强分布情况。并比较了不同入射畸变光通过连续相位板后的远场焦斑顶部均匀性，结果表明：当入射波前畸变的均方根梯度小于0.32 wave/mm 时，连续相位板具有很好的束匀滑效果。Abstract: In the inertial confinement fusion (ICF) system, continuous phase plate (CPP) designed by improved G-S algorithm can be used to improve the far-field distribution of distorted wave-front. Since the smoothing results of CPP for different distorted wave-fronts are different, the smoothing tolerance ability of CPP is analyzed systematically. According to the transmission characteristics of the distorted laser beams, root mean square (RMS) gradient of wave-front is used to quantify the wave-front distortion. And the far-field intensity distributions of different distorted beams which have translated through CPP are calculated by the numerical method. By comparing the uniformity of far-field focal spot after smoothing by CPP, a conclusion can be gotten that when the RMS gradient is under 0.32 wave/mm, CPP has good beam smoothing ability.
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Key words:
- continuous phase plate /
- tolerance /
- wave-front distortion /
- RMS gradient /
- beam smoothing
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