设计了一种Offner光学系统，用于基于相位差异技术的图像恢复和光学系统波像差的辅助检测。该Offner光学系统采用同轴抛物面反射镜作为Offner反射镜，以高速CCD相机和Shack-Hartmann波前探测器作为接收元件，能完好地消除复色光源在图像恢复过程中带来的色差；设计的RMS波像差小于λ/50(λ=6328 nm)，结构简单，容易实现。利用该系统分别以分辨率板和光纤光源为目标进行了图像恢复实验，经过恢复后的图像分辨率提高了19%。此外，利用该系统，采用相位差异算法解算了系统波像差，并与Shack-Hartmann波前探测器的测量结果进行了比较。比较显示两者的RMS波像差测量值相差5%，证明该系统同样能够进行光学波前检测。

Based on phase diversity technology, this paper designs an Offner optical system for image restoration and optical test of wavefront errors. The Offner optical system uses an on-axis parabolic mirror as Offner mirror, and a high speed CCD camera and a Shack-Hartmann wavefront sensor as the receivers to eliminate the chromatic aberration brought by the polychrome light source of the refractive system during image restoration. The system has a simple configuration with the wavefront error(RMS) less than λ/50(λ=6328 nm). By using the system to perform image restoration experiment for a resolution plate and a fiber source, the resolution of restorated image is improved by 19%. In addition, wavefront error test are performed with the Offner optical system using the phase diversity algorithm, and the result demonstrates that the wavefront sensor difference between phase diversity and Shack-Hartmann is 5%, which proves that it is able to perform optical wavefront test with this Offner optical system.