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Optical Engineering

Method for removing longitudinal chromatism in full color holographic projection system
Author(s): Tao Wang; Yingjie Yu; Huadong Zheng
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Paper Abstract

Hologram, as a type of diffractive optical element, is sensitive to wavelength in the process of optoelectronic reconstruction. Due to the different wavelengths of three prime colors used in full color holographic projections, there are chromatisms which badly spoil the reconstructed image. The chromatisms are composed of transverse and longitudinal chromatisms. For a computer generated hologram, transverse chromatism can be compensated by resampling the object information. However, it becomes more complex for longitudinal chromatism. This paper analyzes how the image is reconstructed from the phase-type hologram in a holographic projection system and the causations of longitudinal chromatism. To remove it, this paper proposes loading a specially designed phase distribution on a phase-type hologram. The advantage of this method is that it can be achieved by computer calculation and without adding any hardware such as achromatic optical element. A time-sharing system for a full-color hologram projection is developed in this paper. Comparisons have been made between the reconstructed images with and without chromatism. The experimental result shows that the method is effective in removing longitudinal chromatism and the quality of the reconstructed image is improved.

Paper Details

Date Published: 1 September 2011
PDF: 6 pages
Opt. Eng. 50(9) 091302 doi: 10.1117/1.3596175
Published in: Optical Engineering Volume 50, Issue 9
Show Author Affiliations
Tao Wang, Shanghai Univ. (China)
Yingjie Yu, Shanghai Univ. (China)
Huadong Zheng, Shanghai Univ. (China)

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