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Magneto Optic Display

IP.com Disclosure Number: IPCOM000091599D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Max, E: AUTHOR [+3]

Abstract

When a light beam, linearly polarized perpendicular to its plane of incidence, impinges on a reflecting surface, either magnetized perpendicularly to its plane of incidence or is not magnetized at all, the plane of polarization of the reflected beam is not rotated. If the direction of magnetization of the reflecting surface is parallel to the plane of incidence, the plane of polarization of the reflected beam is rotated by the Kerr angle 6, where delta = 20' to 3'. This results in a Kerr component parallel to the plane of incidence having an intensity of 016% to 3.5% of the intensity of the incident beam.

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Magneto Optic Display

When a light beam, linearly polarized perpendicular to its plane of incidence, impinges on a reflecting surface, either magnetized perpendicularly to its plane of incidence or is not magnetized at all, the plane of polarization of the reflected beam is not rotated. If the direction of magnetization of the reflecting surface is parallel to the plane of incidence, the plane of polarization of the reflected beam is rotated by the Kerr angle 6, where delta = 20' to 3'. This results in a Kerr component parallel to the plane of incidence having an intensity of 016% to 3.5% of the intensity of the incident beam. When a linearly polarized light beam is incident on a plane separating an isotropic substance and an anisotropic substance, two critical angles of total reflection are effective, depending on whether the plane of polarization of the incident beam is parallel or perpendicular to the plane of incidence.

A magneto-optic display making use of these effects has glass plate 1 coated on one face by a matrix-like array of individually magnetizable mirrors 2. A single mirror magnetizable on individual areas and covering the whole face of plate 1 can also be used. The opposite face of plate 1 is coated by anisotropic layer 3, e.g., calcite. The latter has one of its two indices of refraction smaller than, and the other equal to, the index of refraction of plate 1. Collimated light beam 4 is introduced through side face 10 into plate 1. Since beam 4 is incident o...