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Electro Optic Deflection Device

IP.com Disclosure Number: IPCOM000095695D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Smith, WV: AUTHOR

Abstract

The electro-optic device deflects by controlled amounts a polarized light beam, particularly a beam from a wide aperture, narrow divergence source, such as a laser. The polarized beam is sequentially passed in preselected polarization planes through isotropic birefringent elements.

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Electro Optic Deflection Device

The electro-optic device deflects by controlled amounts a polarized light beam, particularly a beam from a wide aperture, narrow divergence source, such as a laser. The polarized beam is sequentially passed in preselected polarization planes through isotropic birefringent elements.

Light source 10 directs beam 12 through polarizer 14, first, second and third electro-optic half-wave plates 16, 18 and 20, respectively, first, second and third birefringent elements 22, 24 and 26, respectively, and lens 28 to surface 30 disposed at the focal plane of lens 28. Each half-wave plate 16, 18 and 20 has a pair of transparent, electrically conductive electrodes 13 and 14. Each half-wave plate can be single crystal sections of potassium dihydrogen phosphate (KDP) or potassium dideuterium phosphate (KD(2)PO(4)) cut with its optic axis normal to the electroded faces of the half-wave plates.

Voltage from a DC voltage source 32 is selectively applied by switches 34, 36 and 38 to half-wave plates 16, 18 and 20 to rotate at each energized plate the plane of polarization of light beam 12 by 90 degrees. Each birefringent element 22, 24 and 26 includes prism a of, e. g., calcite, with its optic axis perpendicular to the plane of the paper, having an index of refraction n2 for ordinary rays but equal to a different value n2 for a polarization in a plane 90 degrees' to the first plane of polarization.

Prism a is cemented to prism b of isotropic material...