高能拍瓦激光器系统中的空间滤波器透镜的色差会影响聚焦强度。研究了用衍射器件预校正系统轴向色差的可行性及设计方法,并给出具体的设计实例。结果表明,单片衍射器件可以预补偿高能拍瓦激光系统的轴向色差,且其总光焦度为零易于使用,特征线宽为数微米。为高能拍瓦激光系统的色差校正提供了一种新的解决思路。

Chromatic aberration associated with large-aperture lens in high-energy petawatt laser system affects the focused intensity. Diffractive optical element has been used to pre-correct primary axial chromatic aberration. Temporal distortion and spatial convergence of focal spot can be improved. A single diffractive chromatic corrector is designed with zero power facilitating alignment and minimal groove of several micrometers. It will serve as a new proposal for correction of chromatic aberration on high energy petawatt laser system.