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为满足惯性约束聚变对靶面光场辐照特性的要求,提出利用互补型偏振控制板改变光束内部偏振态,实现多光束消偏振叠加,进而改善聚焦光场均匀性的方案.建立了光束通过互补型偏振控制板进行变换的物理模型,理论分析了互补型偏振控制板影响聚焦光斑偏振特性的原因,比较了互补型偏振控制板与非互补型偏振控制板对聚焦光斑偏振特性及均匀性的影响,并进一步讨论了偏振控制板单元数的选取问题.结果表明:多光束通过互补型偏振控制板后,聚焦光场不再是单一偏振光,而是各类部分偏振光的随机混合;与其他类型双块偏振控制板相比,互补型偏振控制板能实现聚焦光斑的消偏振叠加且效果最佳,使光斑偏振度下降至0.2以下,并能有效地改善光斑的强度均匀性.采用互补型偏振控制板时,单元数对聚焦光斑偏振特性影响不大,但对强度均匀性则存在一定程度的影响,因而在实际工作中应根据应用需求合理选取单元数.
In order to meet the requirement of irradiance of light field of target surface with inertial confinement fusion, this paper proposes a scheme of using complementary polarization control panel to change the polarization state inside the light beam to realize the depolarization superposition of multi-beams and improve the uniformity of focused light field. The theoretical model of the polarization control panel with complementary polarization control panel is analyzed. The reason that the polarization control panel is affected by the polarization control panel is theoretically analyzed. The polarization characteristics and the uniformity of the focusing spot are compared between the polarization control panel and the non-polarization control panel The results show that the focused light field is no longer a single polarized light but a random mixture of all kinds of polarized light after the multi-light beam passes through the polarization control plate. Compared with other types of double-polarization control boards, the complementary polarization control board can achieve the depolarization superposition of the focusing spot and has the best effect, reducing the spot polarization below 0.2 and effectively improving the intensity uniformity of the spot. Type polarization control panel, the number of units has little effect on the polarization characteristics of the focused spot, but there is a certain degree of impact on the intensity uniformity , So in practice the number of units should be reasonably selected according to application requirements.