Browse Prior Art Database

Light Deflectors

IP.com Disclosure Number: IPCOM000089864D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Suits, JC: AUTHOR

Abstract

The figure of merit, i.e., the rotation/attenuation, of magneto-optical materials has increased to the point where they can be used in lieu of electro-optical materials in light deflecting units. For example, one magneto-optical crystal, cobalt doped RbNiF(3), exhibits high transparency for the visible frequencies of light yet exhibits appreciable Faraday rotation. Such a crystal requires low applied magnetic fields for attaining high rotations of the plane of polarization.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 72% of the total text.

Page 1 of 2

Light Deflectors

The figure of merit, i.e., the rotation/attenuation, of magneto-optical materials has increased to the point where they can be used in lieu of electro-optical materials in light deflecting units. For example, one magneto-optical crystal, cobalt doped RbNiF(3), exhibits high transparency for the visible frequencies of light yet exhibits appreciable Faraday rotation. Such a crystal requires low applied magnetic fields for attaining high rotations of the plane of polarization.

Drawings 1 and 2 show the magneto-optical analog of two electro-optical light deflectors. In drawing 1, light beam 2 enters magneto-optical crystal 4, such as cobalt doped RbNiF(3), and passes through such crystal to impinge upon calcite crystal 6. The ordinary ray 8 and extraordinary ray 10 exit from crystal 6 with a certain separation from one another, depending on the thickness of crystal 6.

Such rays are polarized perpendicular to each other. By sending a current through winding 12 surrounding crystal 4, the plane of polarization of light beam 2 can be rotated 90 degrees in crystal 4, extinguishing either the ordinary beam or the extraordinary beam, depending upon the orientation of the respective planes of polarization of such beams with respect to the optical axes of crystal 6. By using many stages of such deflector units to form an array, a digital-indexed light deflector is obtained.

In drawing 2, calcite crystal 1 and NaF crystal 3 are encased in transparent housing 5...