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在惯性约束聚变(ICF)驱动器设计中,利用正交偏振板改变光束内部偏振态,实现靶面消相干叠加,以进一步改善靶面辐照均匀性。建立了正交偏振板的透过率函数,分别对单光束和多光束叠加两种情况下的焦斑偏振特性及均匀性进行数值模拟和分析。结果表明,利用正交偏振板能较好地实现光束消偏振叠加,焦斑在时间统计上表现为部分偏振光;采用正交偏振板互补组合方式时,消偏振效果随偏振板单元数的变化不敏感,因而可以选取单元数较少的正交偏振板,以降低对加工工艺的要求。
In the design of inertial confinement fusion (ICF) driver, the orthogonal polarization plate is used to change the polarization state inside the beam to realize the decoherence superposition of the target so as to further improve the radiation homogeneity of the target. The transmissivity function of orthogonal polarizer is established. The polarization characteristics and uniformity of focal spot are simulated and analyzed respectively under single beam and multiple beam superposition. The results show that the depolarization of light beams can be achieved by using orthogonal polarizers, and the focal spot appears partially polarized light in time statistics. When the orthogonal polarizer plates are used in combination, the depolarization effect varies with the number of polarizer plates Not sensitive, so you can choose the number of units less orthogonal polarizers to reduce the processing requirements.