波前编码技术在大幅度地增加光学系统景深的同时,可以抑制各种离焦类型的像差。目前波前编码系统的成像特性分析大多是基于空间频率域的分析,在应用稳定相法导出三次型相位板波前编码系统的点扩展函数近似解析式的基础之上,描述了点扩展函数的边界、带宽与振荡等特性,分析了波前编码系统对离焦、像散、彗差等常见像差的敏感性,从空间域进一步分析了波前编码系统的成像特性。

Applying the wavefront coding technique to optical system can greatly increase the depth of focus and correct the focus-related aberrations. While most coventional imaging characteristics analysis of the wavefront coding system is carried out within spatial-frequency domain, here the analysis within spatial domain was applied. The approximate expression of point spread function for the wavefront coding system with cubic phase mask was derived with the stationary phase method, based on which the sensitivities of the wavefront coding system to defocus, astigmatism and coma were analyzed, and the boundary, bandwidth and oscillations of the point spread function were described. A further insight into the imaging characteristics of the wavefront coding system was acquired within spatial domain.