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Proceedings Paper

Pulse-originated human figurative imagery transferred into dichromate gelatin DCG reflection holograms
Author(s): Fred D. Unterseher; August Muth; Rebecca E. Deem
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Paper Abstract

The authors discuss the transfer of human figurative imagery originated with a pulsed ruby laser into dichromate gelatin (DCG) emulsion. Human figurative imagery (live subject matter) has been recorded holographically with pulse laser systems, most commonly with pulsed ruby and frequency doubled Yag lasers using silver halide emulsion due to the short end reciprocity failure of other recording materials. Since the DCG reflection transfer is exposed at 488 nm and the silver transmission master recording is at 694 nm, two of the major considerations for transfers is frequency shift and image size in the DCG hologram. As a display medium, DCG holography is conventionally produced in small format recordings. The authors discuss methods for reducing the imagery optically to better accommodate a small-scale hologram. A reduced image, where the projected image is compressed can work within the constraints of a broad-banded DCG reflection hologram (white/pink coloration), whose limitation of depth, about 2.5 to 3' or 5 to 8 cm has made recording of one to one scale human figurative imagery prohibitive. DCG reflection holograms, volumetric holograms, tend to exhibit a short depth of field and the more broad banded (white in coloration) the more severe the chromatic aberrations in the z-axis. The reduction methods offer image compression in particular with the lens system between H1 and H2, in which case the image from H1 is compressed in the X and Y axis and most importantly in the Z axis. The longitudinal (z-axis) reduction shrinkage is square to that of the transverse reduction. The authors consider the visual appeal and increased efficiency in the final transfer DCG hologram to be well worth the effort. A practical approach is emphasized.

Paper Details

Date Published: 23 March 1999
PDF: 8 pages
Proc. SPIE 3638, Holographic Materials V, (23 March 1999); doi: 10.1117/12.342809
Show Author Affiliations
Fred D. Unterseher, Zone Holografix Studios and Lasart/SolidAir Ltd. (United States)
August Muth, Zone Holografix Studios and Lasart/SolidAir Ltd. (United States)
Rebecca E. Deem, Zone Holografix Studios and Lasart/SolidAir Ltd. (United States)

Published in SPIE Proceedings Vol. 3638:
Holographic Materials V
T. John Trout, Editor(s)

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