用衍射器件校正高能拍瓦激光系统色差的设计研究

Design of Diffractive Optical Elements for Chromatic Aberration Correction in High-Energy Petawatt Laser System

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.