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为了提高惯性约束聚变(ICF)激光装置中连续相位板(CPP)的焦斑性能,建立了波前畸变下连续相位板焦斑的理论计算和分析模型,并根据CPP使用条件搭建了三倍频大口径CPP远场离线测试系统。对加工330mm×330mm口径的CPP和波前畸变元件进行了理论计算和离线测试实验的对比研究。理论计算和实测的焦斑形貌、参数数值均非常一致,验证了计算模型的正确性和实验系统的可靠性。理论和实验结果一致表明,波前畸变对CPP焦斑性能的影响非常严重,当弥散斑为0.5倍CPP焦斑时,畸变量已对CPP焦斑形貌产生了很大影响,能量利用率下降值大于4%,焦斑半径增大超过20μm,陡边阶数下降1.3阶,不均匀性均方根(RMS)值下降6%,旁瓣份额增长超过0.5%。
In order to improve the focal spot performance of the continuous phase plate (CPP) in the inertial confinement fusion (ICF) laser device, the theoretical calculation and analysis model of the continuous phase plate under the wavefront distortion was established. According to the CPP conditions, Large diameter CPP far off-line test system. The theoretical calculation and off-line test of the 330mm × 330mm CPP and wavefront aberration components are compared. Theoretical calculations and measured focal spot morphology, parameter values are very consistent, verify the correctness of the calculation model and the reliability of the experimental system. The theoretical and experimental results show that the influence of wavefront distortion on the focal properties of CPP is very serious. When the diffusion speckle is 0.5 times CPP focal spot, the distortion has a great impact on the morphology of CPP focal spot, and the energy utilization rate decreases When the radius of focal spot increased more than 20μm and the steep edge number decreased by 1.3 steps, the root mean square (RMS) value of inhomogeneity decreased by 6% and the share of side lobe increased by more than 0.5%.