Imaging quality improvement for wavefront colding system with radially symmetrical phase mask

In this paper, we introduce the novel method to improve the image quality for the optical imaging system with the radially symmetrical phase masks. By introducing 0-pi phase mask into the radially symmetrical one, the new phase mask is generated, which produces the dark-shape point spread function. By rotating this phase mask with the amplitude mask for different angles, the point spread function is still rotated by the same angle. Moreover, the digital processing is used to restore the high-quality image. The simulation results demonstrated the effectiveness of the proposed method in comparison to the previously radially symmetrical phase mask.