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Proceedings Paper

In-line digital holography using a quarter wave plate and averaging method
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Paper Abstract

In-line digital holography using a quarter wave plate and averaging technique is described in this paper. In-line digital holographic scheme inherently suffers from DC and conjugate object image noise terms. This problem can be overcome by using phase shifting technique which usually requires four digital holograms. However, it requires four successive holograms, which makes it less robust in relatively poor environment than one-shot off axis scheme. This study is on two-exposure method employing only a quarter wave plate which can produce 90 degree phase difference between two successive holograms. The two-exposure method can provide conjugate-free reconstruction capability. Also, the DC terms can be minimized by applying averaging technique for object DC term. Detail explanation on how to reduce the DC term noise and how the intensity level of reference and object wave can affect the reconstructed image quality is discussed. Although the reconstructed image quality has a little undesired background noise compared with the conventional four frame method, it has a benefit in the sense that it requires only two holograms for eliminating the DC and the conjugate terms. The numerically reconstructed results show the feasibility of the two-exposure method and it may be capable of providing more robust approach in on-axis scheme.

Paper Details

Date Published: 25 October 2004
PDF: 8 pages
Proc. SPIE 5599, Three-Dimensional TV, Video, and Display III, (25 October 2004); doi: 10.1117/12.571726
Show Author Affiliations
Daesuk Kim, Univ. of Connecticut (United States)
Bahram Javidi, Univ. of Connecticut (United States)

Published in SPIE Proceedings Vol. 5599:
Three-Dimensional TV, Video, and Display III
Bahram Javidi; Fumio Okano, Editor(s)

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