光学学报, 2010, 30 (5): 1464, 网络出版: 2010-05-11   

电控振幅型超分辨光瞳滤波器的调谐特性分析

Tuning Analysis of Electrically Controlled Amplitude-based Superresolution Pupil Filter
作者单位
南京航空航天大学 应用物理系,江苏 南京 210016
摘要
根据空间偏振态调制和偏振干涉的原理,设计了一种能通过外加电压调谐的振幅型光瞳滤波器,实现了横向超分辨下轴向焦移与焦深的实时控制。该滤波器由两个透射光轴平行的偏光镜,置于其间的一个电光晶体和一个二区域λ/2波片组成。分析了滤波后光学系统焦点附近光强的分布及电光调谐特性,在电光相位延迟-π-π之间,二区域λ/2波片内外径取优化值时,可实现横向超分辨及轴向焦移的实时调控,等效于一个可实现横向超分辨的电光调焦透镜。电光相位延迟一定时,二区域λ/2波片内区方位角的改变可实现第一零点比的调整;内区方位角一定时,电光相位延迟的改变可实现焦深的实时控制。
Abstract
Based on space-variant polarization manipulation and polarizing interference,a set of amplitude pupil filters is presented. The control of axial focal shift and extended focal depth can be realized when keeping the transverse superresolution. This filter consists of two parallel polarizers,an electro-optical crystal and a two-zone half-wave plate. The electro-optical tuning characteristic and modulated distribution of intensity in the focal region of the filtered optical system are analyzed. When the modulated phase delay varies from –π to π,the real-time control of the focal shift and transverse superresolution behavior can be obtained. Here this system can be realized as a lens having variable focus with transverse superresolution adjusted by external voltage. The ratio of the first zero position can be modulated by azimuth angle of the inner λ/2 plate when the electro-optical phase delay is chosen. The electro-optical phase delay to change the focal depth can be realized in real-time control when the azimuth angle of the inner λ/2 plate is chosen.

谢翊乐, 王吉明, 刘友文. 电控振幅型超分辨光瞳滤波器的调谐特性分析[J]. 光学学报, 2010, 30(5): 1464. 谢翊乐, 王吉明, 刘友文. Tuning Analysis of Electrically Controlled Amplitude-based Superresolution Pupil Filter[J]. Acta Optica Sinica, 2010, 30(5): 1464.

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