Liu Tao, Tan Jiubin, Liu Jian
Institute of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150001, China.
Opt Express. 2010 Feb 1;18(3):2822-35. doi: 10.1364/OE.18.002822.
Spoke wheel filtering strategy is developed using the proposed spoke wheel filter (SWF) and solving the nonlinear optimization model established by introducing a super-Gaussian function. Theoretical calculations through simulated annealing algorithm indicate that high focal depth is obtained by increasing the number of curved sectors composing SWF, while the peak-valley intensity oscillation is reduced by bending them appropriately and slightly changing their amplitude transmittances. The transverse in-focus spot compresses when the center-shaded circle of SWF enlarging. Comparison shows that SWF outperforms radial-symmetric pupil filters in its largely reduced intensity oscillation and very flexible design of focal depth extension.
使用所提出的辐条轮滤波器（SWF）并求解通过引入超高斯函数建立的非线性优化模型，开发了辐条轮滤波策略。通过模拟退火算法进行的理论计算表明，通过增加构成SWF的弯曲扇区数量可获得高焦深，同时通过适当弯曲它们并略微改变其振幅透过率可减少峰谷强度振荡。当SWF的中心阴影圆扩大时，横向焦内光斑会压缩。比较表明，SWF在大幅降低强度振荡和焦深扩展的非常灵活的设计方面优于径向对称光瞳滤波器。
