Dependence of diffraction efficiency on storage density in digital holographic memory using bacteriorhodopsin

Charles K. Gary

doi:10.1117/12.262629

27 December 1996 Dependence of diffraction efficiency on storage density in digital holographic memory using bacteriorhodopsin

Charles K. Gary

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Proceedings Volume 2969, Second International Conference on Optical Information Processing; (1996) https://doi.org/10.1117/12.262629
Event: Second International Conference on Optical Information Processing, 1996, St. Petersburg, Russian Federation

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.

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Charles K. Gary "Dependence of diffraction efficiency on storage density in digital holographic memory using bacteriorhodopsin", Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); https://doi.org/10.1117/12.262629

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