13 February 2012 Suppression of the zero-order diffraction beam from computer-generated holograms produced by a DLP spatial light modulator
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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.
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Sih-Ying Wu, Sih-Ying Wu, Jinyang Liang, Jinyang Liang, Michael F. Becker, Michael F. Becker, } "Suppression of the zero-order diffraction beam from computer-generated holograms produced by a DLP spatial light modulator", Proc. SPIE 8254, Emerging Digital Micromirror Device Based Systems and Applications IV, 82540C (13 February 2012); doi: 10.1117/12.907413; https://doi.org/10.1117/12.907413
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