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25 May 1989 In-Situ Swelling For Holographic Color Control
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Proceedings Volume 1051, Practical Holography III; (1989) https://doi.org/10.1117/12.951477
Event: OE/LASE '89, 1989, Los Angeles, CA, United States
Abstract
Deliberate variations of the emulsion thickness between holographic exposures and reconstruction produce a range of output wavelengths from a fixed exposure wavelength, a technique known as "pseudo-color" multi-color reflection holography. Usual methods require the removal of the film or plate from the holographic setup between exposures for imbibition of a swelling agent, followed by drying and replacement, so that a retention of the swelling agent forces a physical increase in the thickness of the emulsion. The density (and hence the thickness) of the gelatin binder can also be varied by changing its electrolytic environment. By immersing the holographic emulsion in a suitable solution, allowing it to come to a new equilibrium thickness, and exposing with a long-wavelength laser, shorter wavelength reconstructions can be obtained without removing the film or plate from the setup. Accurate changes of solution can make a precise sequence of swellings possible, producing multiple reconstruction colors from a set of constant-wavelength recordings. Here we describe pre-treatments of the emulsion that make rapid and stable equilibria possible, and swelling bath sequences that produce color primaries suitable for full-color computer-graphic holographic imagery.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Julie L. Walker and Stephen A. Benton "In-Situ Swelling For Holographic Color Control", Proc. SPIE 1051, Practical Holography III, (25 May 1989); https://doi.org/10.1117/12.951477
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