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Optical Engineering

Total aberrations compensation for misalignment of telecentric arrangement in digital holographic microscopy
Author(s): Yun Liu; Zhao Wang; Jiansu Li; Jianmin Gao; Junhui Huang
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Paper Abstract

The telecentric arrangement in digital holographic microscopy (DHM), considered to be a pure-physical compensation for defocus aberration introduced by microscope objective (MO), shows shift-invariant behavior. Its optical arrangement requires precise adjustment of the distance between MO aperture stop and collimated lens. However, it is difficult to measure and quantify the distance even by monitoring the spatial frequency spectrum of recorded hologram in the absence of object. Thus the misalignment results in the residual defocus aberration in the telecentric arrangement. The total aberrations compensation for misalignment of telecentric arrangement in DHM is presented, in which a posteriori surface fitting method based on Zernike polynomials is performed to eliminate the residual defocus aberration as well as other primary aberrations. The approach reduces the difficulty in precise alignment of the telecentric arrangement and decreases the measurement error caused by aberrations in construction. Three-dimensional retrieval of the height for micro-hole arrays with high-spatial-frequency content demonstrates the feasibility of the method.

Paper Details

Date Published: 3 April 2014
PDF: 9 pages
Opt. Eng. 53(11) 112307 doi: 10.1117/1.OE.53.11.112307
Published in: Optical Engineering Volume 53, Issue 11
Show Author Affiliations
Yun Liu, Xi'an Jiaotong Univ. (China)
Zhao Wang, Xi'an Jiaotong Univ. (China)
Jiansu Li, Xi'an Jiaotong Univ. (China)
Jianmin Gao, Xi'an Jiaotong Univ. (China)
Junhui Huang, Xi'an Jiaotong Univ. (China)

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