基于晶体的“非三明治”结构可调横向超分辨光瞳滤波器设计  

Non-Sandwich-Structured Tunable Transverse Superresolving Pupil Filters Based on Birefringent Crystals

作　　者：朱化凤 刘为森 衡科尹 陈胜 戈立娜 

机构地区：[1]中国石油大学(华东)理学院,山东青岛266580

出　　处：《中国激光》2012年第10期220-226,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(10904080);山东省自然科学基金(Y2008A34;ZR2012DL12);国家级大学生创新创业训练计划创新训练项目(111042563);山东省优秀中青年奖励基金(BS2011DX007);2012年青岛市科技发展计划--应用基础研究[12-1-4-7-(7)-jch]资助课题

摘　　要：研究了基于双折射晶体的非"三明治"结构的分区光瞳滤波器在低数值孔径聚焦系统中的光学特性。以内区为玻璃和外区为双折射晶体的两区光瞳滤波器为例,给出了此类光瞳滤波器光瞳函数的精确表达式。结合标量衍射理论,数值模拟了其光学特性。结果表明,通过旋转光瞳滤波器可以实现系统焦平面上横向光学超分辨的连续调节,同时可以扩展焦深。这种滤波器较现有的基于双折射晶体的光瞳滤波器具有更高的光能利用率,并且其可调性更方便于实际应用。The optical properties of ＂non-sandwich-structured＂ zonal pupil filter based on birefringent crystal are studied in focusing optical systems with low numerical aperture.The exact pupil function of the new filter is presented by taking glass and birefringent crystal for the inner and outer zone respectively as an example.Numerical simulations of its optical properties are carried out with scalar diffraction theory,which shows that tunable transverse superresolution properties as well as extended axial focal depth can be obtained by rotating the pupil filter.This kind of filter has higher light utilization ratio than the existed pupil filters based on birefringent crystals,and its tunable ability can provide more flexibility in practical applications.

关 键 词：物理光学 可调光瞳滤波器 双折射晶体 横向超分辨 焦移 

分 类 号：O439[机械工程—光学工程]