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Proceedings Paper

Dependence of diffraction efficiency on storage density in digital holographic memory using bacteriorhodopsin
Author(s): Charles K. Gary
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Paper Abstract

This paper reports preliminary measurements of the dependence of diffraction efficiency for individual holograms stored in bacteriorhodopsin (BR) on the total number of holograms present in the medium. BR is an organically derived photochromic material that is well suited for use in 3D digital holographic memory. Upon the absorption of photons BR shifts from a ground state with a peak absorption in the red to an excited state with a peak absorption in the blue. Thus images may be written and erased in BR by using different wavelength light sources. Recent advances have led to the ability to permanently store volume holograms in BR films with the ability to repeatedly read, write and erase these holograms. One of the critical parameters that will determine the density of information contained in a BR-holographic memory is the decay of the diffraction efficiency, and thus read-out signal to noise ratio, for individual hologram as other holograms are written into the same space. The diffraction efficiency appears to depend exponentially on the number of holograms for low exposures and vary as a slower exponential or the inverse of the number of holograms for large exposures.

Paper Details

Date Published: 27 December 1996
PDF: 10 pages
Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); doi: 10.1117/12.262629
Show Author Affiliations
Charles K. Gary, NASA Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 2969:
Second International Conference on Optical Information Processing
Zhores I. Alferov; Yuri V. Gulyaev; Dennis R. Pape, Editor(s)

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