We demonstrate the storage of 1000 holograms in a memory architecture
that makes use of different wavelengths for recording and readout to reduce
the grating decay while retrieving data. Bragg-mismatch problems from the use
of two wavelengths are minimized through recording in the image plane and
using thin crystals. Peristrophic multiplexing can be combined with angle
multiplexing to counter the poorer angular selectivity of thin crystals. Dark
conductivity reduces the effectiveness of the dual-wavelength method for
nonvolatile readout, and constraints on the usable pixel sizes limit this
method to moderate storage densities.
© 1997 Optical Society of America
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