脉冲压缩光栅光路调节新方法研究

介绍了一种简单而实用的大口径脉冲压缩光栅光路调节方法,有效解决了普通光路调节方法中轴向调节精度不高的问题。首先由全息透镜(光栅)成像公式出发,推导出了该光路调节的基本原理。并从光栅记录系统与光栅衍射波像差的关系,结合初级像差理论推导得出叠栅条纹像差为0.4786λ,大约是光栅衍射波像差(0.25λ)的两倍,利用此关系也可对光栅衍射波像差进行实时监测。从数值模拟结果可知,利用叠栅条纹法调节光路可将光栅波像差减至0.06λ,相应的轴向误差量为0.007 mm,可有效提高了轴向调节精度。

New Method to Regulate Light Path of Pulse Compression Grating

A simple and practical method, moiré fringe method (MFM), for adjusting the light path of the pulse compression grating with a great aperture is introduced, with which the longitudinal precision of the conventional light path adjustment is improved. With the imaging formula of the holographic lens, the principle of the light path adjustment is deduced. With the primary aberration theory and relationship between the optical recording system and the diffraction wavefront aberration of the grating, it is concluded that the aberration of the moiré fringe is 0.4786λ, approximately twice of the diffraction wavefront aberration of grating. According to the above numerical relation, the diffraction wavefront aberration of the grating can be monitored. From the simulation, it is presented that, the wavefront aberration can be reduced to 0.06λ, corresponding to the longitudinal error of 0.007 mm.