Extend focal depth of a tracking lens by phase apodizers

Xianyang Cai; Shoude Chang; Costel Flueraru

doi:10.1117/12.625007

14 October 2005 Extend focal depth of a tracking lens by phase apodizers

Xianyang Cai, Shoude Chang, Costel Flueraru

Proceedings Volume 5962, Optical Design and Engineering II; 596216 (2005) https://doi.org/10.1117/12.625007
Event: Optical Systems Design 2005, 2005, Jena, Germany

Abstract

In a conventional particle tracking system, the depth of field is usually very small because of the use of high power imaging lens. The tracking accuracy may also be affected by the smearing of spot image, caused by focal shift. Increasing the focal depth and keeping uniform spot size in the focal region is highly desirable for a high accurate tracking system. In this report, we study the design of phase apdodizer that could be used to increase the focal depth of a tracking lens. The design is based on the requirements by highly accurate tracking that the point-spread function (PSF) of the lens keep an even and concentrated energy distribution when the lens is defocused. To achieve this purpose, a pure phase-shifting apodizer is introduced on the pupil plane of the lens. The function of the apodizer is to control the energy distribution of the 3D diffraction pattern near the focal region and make the effective spot size uniform or minimum variation along optical axis. The pattern of the 3D PSF of the lens with the apodizer shapes closed to a cylinder. New method used to search and optimize the design of the phase apodizer that meet the requirements of a particle tracking system will be studied. Theoretical analysis and numerical simulation are given in support of the method.

Citation Download Citation

Xianyang Cai, Shoude Chang, and Costel Flueraru "Extend focal depth of a tracking lens by phase apodizers", Proc. SPIE 5962, Optical Design and Engineering II, 596216 (14 October 2005); https://doi.org/10.1117/12.625007

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KEYWORDS

Point spread functions

Binary data

Imaging systems

Particles

Particle systems

3D image processing

Lens design

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