电控径向双折射滤波器的横向超分辨与轴向扩展焦深  

Transverse Superresolution and Axial Extended Focal Depth with Electrically Controlled Radial Birefringent Filter

作　　者：王吉明[1] 刘立人[1] 云茂金[2] 赵栋[1] 刘锡民[1] 郎海涛[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]青岛大学理工学院物理系,青岛266071

出　　处：《光学学报》2006年第6期903-908,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60177016);国家科技部重大基础研究专项基金(2002CCA03500)资助课题

摘　　要：提出利用电控径向双折射光瞳滤波器实现横向超分辨性能参量的调制与轴向扩展焦深。该光瞳滤波器由两个平行偏光镜,一个电光晶体与一个径向对称双折射晶体组成。分析了电光晶体与径向双折射元件对光偏振态的空间调制作用,通过控制电光晶体的相位延迟实现径向中心处初始偏振态的控制,与径向双折射元件横向偏振态调制结合,实现了庞加莱球上偏振态演变路径与阶段的控制,从而对焦点附近偏振态进行空间调制以实现光强的重新分布。研究结果表明,外加电场调制可以实现横向上超分辨性能的调控以及轴向上焦深的扩展,并可得到相应的电光相位延迟范围。An electrically controllable radial birefringent pupil filter for modulation of transverse superresolution performance and axial extended focal depth is proposed. It consists of two parallel polarizers, an electro-optical crystal and a birefringent crystal with radial symmetry. The spatial modulation of the optical polarization state at the electro-optic crystal and the radial birefringent device is analyzed. The initial optical polarization state at the radial center is determined by the phase delay of the electro-optic crystal. Combined with the transverse polarization state modulation by the birefringent device, the control of the polarization state evolution path and the stage on the Poincare sphere, and the redistribution of the optical intensity by spatially modulating the polarization state near the focus are realized. The control of transverse superresolution performance and the axial extended focal depth can be realized merely through the applied-voltage modulation, and the phase delay range can simultaeously be obtained.

关 键 词：信息光学 偏振态 电光调制 横向超分辨 扩展焦深 

分 类 号：TB851[一般工业技术—摄影技术]