1 July 1990 Pseudocolor information coded with image holograms using theta modulation
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Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22192
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany
Abstract
We describe an experimental method to produce image holograms that reproduces an im--- age with an specific color code. First we codify the scene using the theta modulation technique. Then a 4f optical image processor is used to decodify the information. Fi nally the decoded image is recorded holographically using a different reference beam an gle for each different scene. We take special care to make sure that the area illumi nated by the reference beam is the same area of the decoded image. In this way we have a multiple hologram which reproduces the image with the selected color code with a very high efficiency. 2. BASIC ThEORY When we illuminate a diffraction grating with a monocromatic plane wave with normal incidence the amplitud distribution after the grating will be equal to a set of plane waves with angular directions related by: dsenOm mA (1) Where d is the period of the grating A is the wave length of the incident radiation and m is the order of interference. For any particular value of m (m o) the regular desviation or direction of propagation depends directly of A. That is for: X A2 0 0 2'' We are interested in observe in the same direction (m constant) different wve legths when we illuminate our grating with a polycromatic plane wave. According to Ec. (1) the only
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eduardo Tepichin, Eduardo Tepichin, Luis R. Berriel, Luis R. Berriel, C. Garcia, C. Garcia, } "Pseudocolor information coded with image holograms using theta modulation", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.22192; https://doi.org/10.1117/12.22192
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