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Proceedings Paper

Suppression of the zero-order diffraction beam from computer-generated holograms produced by a DLP spatial light modulator
Author(s): Sih-Ying Wu; Jinyang Liang; Michael F. Becker
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Paper Abstract

We present a new optical technique to suppress the unwanted zero-order diffraction (ZOD) in holograms produced by the digital micromirror device (DMD). The proposed optical architecture consists of two light beams illuminating the DMD in an interferometer configuration. The two beams are incident from different angles, +24° and -24°, in order to utilize light diffracted from all the pixels to produce a binary Fresnel hologram. The relation between these two beams diffracting from the DMD was found to be complementary, and they both generated the same reconstructed image pattern. With π phase difference between the two beams, the diffracted beams had their ZOD components out of phase while the reconstructed holograms were identical and in phase. Experiments were conducted to demonstrate ZOD suppression by destructive interference and simultaneous hologram enhancement by constructive interference. The method was shown to suppress the ZOD by a factor of 2.9 in a Fresnel hologram.

Paper Details

Date Published: 13 February 2012
PDF: 8 pages
Proc. SPIE 8254, Emerging Digital Micromirror Device Based Systems and Applications IV, 82540C (13 February 2012); doi: 10.1117/12.907413
Show Author Affiliations
Sih-Ying Wu, The Univ. of Texas at Austin (United States)
Jinyang Liang, The Univ. of Texas at Austin (United States)
Michael F. Becker, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 8254:
Emerging Digital Micromirror Device Based Systems and Applications IV
Michael R. Douglass; Patrick I. Oden, Editor(s)

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