LTG AlGaAs non-linear optical material and devices fabricated th

Details LTG AlGaAs non-linear optical material and devices fabricated th LTG AlGaAs non-linear optical material and devices fabricated th

1994-06-22

1996-04-16

Lerner, Martin

Optical: systems and elements

Holographic system or element

Having particular recording medium

252 623GA, 257431, 257436, 359 7, 359248, G02F 1015, G02F 135, H01L 310232

Patent

active

055088295

ABSTRACT:
A light responsive device (10) has a body (12) that includes a matrix comprised of Group III-V material, the matrix having inclusions (14) comprised of a Group V material contained therein. The body is responsive to a presence of a light beam that has a spatially varying intensity for modifying in a corresponding spatially varying manner a distribution of trapped photoexcited charge carriers within the body. The distribution of trapped charge carriers induces a corresponding spatial variation in at least one optical property of the Group III-V material, such as the index of refraction of the Group III-V material and/or an absorption coefficient of the Group III-V material. The Group III-V material is comprised of LTG GaAs:As or LTG AlGaAs:As. In an optical storage medium embodiment of the invention the spatial variation in the intensity of the light beam results from a simultaneous application of a first light beam (LB1) and a second light beam (LB2) to the body, and from interference fringes resulting from an intersection of said first and second light beams.

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