一种基于OTF稳定性的波前编码相位板优化方法

Simple OTF Stability Based Method for Pupil Phase Mask′s Optimization in Wavefront Coding System

提出了一种简单的可用于光学系统中子午弧矢方向白光OTF稳定性评价的波前编码相位板参量优化方法.该方法仅以标准偏差来评价OTF在目标景深范围内的稳定性,并且结合自适应模拟退火算法在参量空间内优化得到相位板的最佳参量.使用该方法优化得到的相位板参量,可以大幅度提高光学系统的景深,并且可以获得更为清晰、稳定的成像.对应用波前编码技术前后光学系统的成像性能作了比较,并且考察了优化参量的容差性.

By using the wavefront coding technique to an optical system,the depth of focus can be greatly increased. Several complicated methods have already been taken to optimize for the best pupil phase mask in ideal condition. Here one simple optical transfer function （OTF） stability based method with only sagittal and tangential polychromatic OTF taken into account is applied to optimize for the best coefficients of pupil phase mask in practical optical systems. Only the standard deviation based metric is used to evaluate the OTF stability over the depth of focus, and a simple Adaptive Simulated Annealing （ASA） searching strategy is applied to search for the best coefficients in the coefficients space. Better and more stable imaging quality over a larger depth of focus is acquired with the optimized pupil phase mask. The imaging quality of systems with and without optimized pupil phase mask is compared and the tolerance for coefficients is calculated.