利用偏振控制板实现惯性约束聚变（ICF）驱动器靶面光束消相干叠加，以达到进一步改善靶面辐照均匀性的目的。通过分析偏振控制板对改变光束内部偏振态的作用，建立了偏振控制板透射函数模型。在此基础上，数值模拟和分析了偏振控制板对焦斑特性的影响，并采用焦斑偏振度的期望和标准差来描述焦斑的消偏振特性，使用光通量对比度评价焦斑强度均匀性。通过讨论偏振控制板单元数、光束带宽和积分时间等参数对焦斑消偏振特性及辐照均匀性的影响，得到利用偏振控制板能较好地实现焦斑消偏振，并改善靶面辐照均匀性的结论。

A polarization control plate (PCP) is applied to achieve incoherent superposition of beamlets on target for further improving illumination uniformity in inertial confinement fusion (ICF) driver. By analyzing the effect of PCP on the modification of the polarization of beamlets, the model for the transmittance function of PCP is built up. The effects of PCP on the characteristics on focal spot are simulated numerically and analyzed theoretically. The expectation and variance of degree of polarization (DOP) are used to describe depolarization characteristics on focal spot, and the contrast is employed to evaluate illumination uniformity. The effects of number of PCP elements, bandwidth and integral time on the characteristics on focal spot are discussed in detail. The results show that polarization control plate can well obtain depolarized laser beam and improve uniformity on target.