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Proceedings Paper

Color images with the MIT holographic video display
Author(s): Pierre St-Hilaire; Stephen A. Benton; Mark E. Lucente; Paul M. Hubel
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Paper Abstract

The MIT holographic video display can be converted to color by illuminating the 3 acoustic channels of the acousto-optic modulator (AOM) with laser light corresponding to the red, green, and blue parts of the visible spectrum. The wavelengths selected are 633 nm (red), 532 nm (green), and 442 nm (blue). Since the AOM is operated in the Bragg regime, each wavelength is diffracted over a different angular range, resulting in a final image in which the three color primaries do not overlap. This situation can be corrected by shifting the diffracted spatial frequencies with an holographic optical element (HOE). This HOE consisting of a single grating is placed right after the AOM in the optical setup. Calculation of the required spatial frequency for the HOE must take into account the optical activity of the TeO2 crystal used in the AOM. The HOE introduces distortions in the final image, but these are so small as to be visually negligible. The final images are of a good quality and exhibit excellent color registration. The horizontal view zone, however, diminishes for the shorter wavelengths.

Paper Details

Date Published: 1 May 1992
PDF: 12 pages
Proc. SPIE 1667, Practical Holography VI, (1 May 1992); doi: 10.1117/12.59642
Show Author Affiliations
Pierre St-Hilaire, Media Lab./MIT (United States)
Stephen A. Benton, Media Lab./MIT (United States)
Mark E. Lucente, Media Lab./MIT (United States)
Paul M. Hubel, Media Lab./MIT (United States)

Published in SPIE Proceedings Vol. 1667:
Practical Holography VI
Stephen A. Benton, Editor(s)

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