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Proceedings Paper

Method of reduction of zeroth order intensity in computer generated holograms by use of phase addition technique
Author(s): D. W. K. Wong; G. Chen
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Paper Abstract

Diffractive optical elements are commonly used to produce a regular array of spots or an arbitrary pattern from a single coherent source. A challenge in the use of diffractive elements is the zeroth order in the reconstructed image. An analysis of the zeroth order attributed to fabrication limitations is performed via simulation and the sensitivity of the zeroth order intensity to surface relief height is determined. Two methods are proposed to reduce the zeroth order by introducing a rectangular phase aperture to compensate for the zeroth order complex amplitude, and a checkerboard phase plate to decouple the zeroth order intensity from the central zeroth order and redistribute the energy away from the reconstructed image. The second method is found to be favourable in suppressing the zeroth order and a subsequent analysis is performed to determine the tolerance of the technique to fabrication accuracies.

Paper Details

Date Published: 20 February 2007
PDF: 10 pages
Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880P (20 February 2007); doi: 10.1117/12.698159
Show Author Affiliations
D. W. K. Wong, Nanyang Technological Univ. (Singapore)
G. Chen, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 6488:
Practical Holography XXI: Materials and Applications
Roger A. Lessard; Hans I. Bjelkhagen, Editor(s)

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