利用晶体相位板同时实现焦斑整形和偏振匀滑

提出了一种新方法, 采用单轴晶体制作相位板, 可同时实现对惯性约束聚变激光驱动器靶点焦斑的整形和偏振匀滑. 采用标量衍射方法分析了晶体相位板的原理, 从焦斑的分布特征出发求解晶体的最佳面形. 在某装置参数条件下, 对晶体相位板的应用效果进行了数值模拟. 结果表明, 在特定的晶体切割角度和面形条件下, 晶体相位板能够对靶点焦斑进行有效的整形和匀滑, 其效果与连续相位板和偏振匀滑晶体的组合相当.关键词：相位板单轴晶体焦斑整形偏振匀滑

A new method of simultaneous focal spot shaping and polarization smoothing using crystal phase plate

A new method is proposed in which uniaxial crystal is used to fabricate the phase plate, with which shaping and polarization smoothing of the target focal spot can be achieved simultaneously in the laser driver of inertial confinement fusion. The principle of crystal phase plate (PS-CPP) is analyzed using the scalar diffraction theory. The solution of crystal surface shape is obtained from the distribution characteristics of the focal spot. Numerical simulation is developed to analyze the application of PS-CPP. The results show that under the conditions of particular crystal cutting angle and surface shape, PS-CPP can be obviously effective for focal spot shaping and smoothing, and the effectiveness is as good as that of the combination of continuous phase plate and the polarizing smoothing crystal.
Keywords：phase plateuniaxial crystalfocal spot shapingpolarization smoothing