Browse Prior Art Database

Control System for Electro Optic Digital Light Deflector

IP.com Disclosure Number: IPCOM000092395D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Chang, DC: AUTHOR

Abstract

The system of light deflectors and circuits applies voltages to the deflectors to digitally position a light beam that is transmitted through the deflectors. Each deflector includes crystal 2 that refracts light along either path 3 or 4 according to the plane of polarization of the light. A deflector also includes electro-optic crystal 5 that rotates the plane of polarization by 90 degrees when a suitable voltage is applied across its electrodes 6 and 7. In systems of this type, light can be applied to the first stage in a polarization to be transmitted along the undeflected path 3 in the absence of a voltage on the electrodes. A voltage on the electrodes rotates the polarization to a plane where the light is deflected to path 4.

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Control System for Electro Optic Digital Light Deflector

The system of light deflectors and circuits applies voltages to the deflectors to digitally position a light beam that is transmitted through the deflectors. Each deflector includes crystal 2 that refracts light along either path 3 or 4 according to the plane of polarization of the light. A deflector also includes electro-optic crystal 5 that rotates the plane of polarization by 90 degrees when a suitable voltage is applied across its electrodes 6 and 7. In systems of this type, light can be applied to the first stage in a polarization to be transmitted along the undeflected path 3 in the absence of a voltage on the electrodes. A voltage on the electrodes rotates the polarization to a plane where the light is deflected to path 4. Driver circuits are provided to control the voltage on the electro-optic crystals and the light transmitted through a series of deflector stages is digitally positioned according to the binary control signals C that are applied to the drivers.

For deflector stages other than the first, the relationship between the desired deflection and the appropriate voltage on the crystal is complicated by the fact that the plane of polarization may have been rotated by a preceding deflector stage. For example, if a voltage is applied to the electrodes of the first stage to deflect the light along path 4, a voltage applied to the second stage rotates the light further to its original plane of po...