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Proceedings Paper

Generation Of A Binary Phase Only Filter Using A Laser Scanner
Author(s): Q. Tang; E. Jager; T. Tschudi
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Paper Abstract

A simple method for generating phase-only filters is proposed. The interference of the Fourier phase value with a tilted plane reference wave is done by computer calculation. This amplitude modulated transmittance function encodes the pure Fourier phase information of the object wave. It acts like an off-axis phase only filter. After the binarization step the filter function is recorded directly into the recording medium in final size using a laser scanner. This results in a binary point-orinted hologram. Compared with the conventional matched filter our binary filter can save the spatial bandwidth product. It further reduces the dynamic range of the Fourier spectrum, thus increasing the diffraction efficiency. We discuss the performces of these filters, present computer simulations and demonstrate experimental results.

Paper Details

Date Published: 25 October 1989
PDF: 6 pages
Proc. SPIE 1134, Optical Pattern Recognition II, (25 October 1989); doi: 10.1117/12.961619
Show Author Affiliations
Q. Tang, Institut fur Angewandte physik, TH Darmstadt (Germany)
E. Jager, Institut fur Angewandte physik, TH Darmstadt (Germany)
T. Tschudi, Institut fur Angewandte physik, TH Darmstadt (Germany)

Published in SPIE Proceedings Vol. 1134:
Optical Pattern Recognition II
H. John Caulfield, Editor(s)

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