Coded-wavelength multiplex volume holography

Details Coded-wavelength multiplex volume holography Coded-wavelength multiplex volume holography

1996-04-30

2000-02-08

Chang, Audrey

Optical: systems and elements

Holographic system or element

Having defined page composer

359 3, 359 10, 359 24, 359 32, 365216, G02B 532, G03H 110, G03H 122, G03H 128

Patent

active

060233559

ABSTRACT:
A method for coded-wavelength multiplexing according to which a signal waves S.sub.i (r) is recorded in a holographic medium in a counter-propagating geometry using corresponding writing reference waves R.sub.i (r). The method involves selecting discrete wavelengths .lambda. and encoding reference wave vectors .rho..sub.l which make up writing reference waves R.sub.i (r) such that the writing reference waves R.sub.i (r) at each wavelength .lambda. are orthogonal. The stored signal waves S.sub.i (r) are reconstructed in the form of reconstruction waves A.sub.c (.sigma.) with reconstruction reference waves R.sub.c (r) selected from among the writing reference waves R.sub.i (r). In the event of angular multiplexing of the reference wave vectors .rho..sub.l, it is possible to use one reference wave to produce a number of reconstruction waves A.sub.c (.sigma.) and generate a mosaic of desired holographic pages.

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