Generation of a high depth of focus with constant transversal spot size using a phase-only pupil filter

被引：4
|
作者：
Iwaniuk, D. [1 ]
Hack, E. [1 ]
Rastogi, P. [2 ]
机构：
[1] EMPA, Lab Elect Metrol Reliabil, Swiss Fed Labs Mat Sci & Technol, Dubendorf, Switzerland
[2] Ecole Polytech Fed Lausanne, Appl Comp & Mech Lab, Lausanne, Switzerland
来源：
JOURNAL OF MODERN OPTICS | 2010年 / 57卷 / 21期
基金：
瑞士国家科学基金会;
关键词：
phase modulation; pupil filter design; high depth of focus; PSF; PSEUDO-NONDIFFRACTING BEAMS; OPTICAL IMAGING-SYSTEMS; EXTENDED DEPTH; FOCAL DEPTH; SUPERRESOLUTION; ELEMENT; LENSES;
D O I：
10.1080/09500340.2010.529516
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel approach is proposed to obtain an extended depth of focus (DoF) in white light with constant transversal spot size within the DoF. It combines a phase-only pupil filter based on multiplexed radial zones with alternating quartic phase functions. The design is first tested via numerical simulations of the point spread function (PSF) based on the scalar diffraction theory. The results for a fourfold gain of the depth of focus are experimentally verified with a phase-only spatial light modulator liquid crystal device combined with a 3D PSF measurement system. A close conformity between the experimental and simulation results proves the effectiveness of the proposed approach.
引用
收藏
页码：2141 / 2146
页数：6
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