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Electro Optic Switch

IP.com Disclosure Number: IPCOM000092892D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Davidse, PD: AUTHOR [+2]

Abstract

This electro-optic switch ernbodies laminated structure. This results in an improved electrical bond between the potassium dihydrogen phosphate KDP crystal and the electrodes.

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Electro Optic Switch

This electro-optic switch ernbodies laminated structure. This results in an improved electrical bond between the potassium dihydrogen phosphate KDP crystal and the electrodes.

In electro-optic switches, the transparent electrodes necessary for operation cannot be applied directly to the KDP crystal. Apparently some reaction takes place between the conductive coating and the crystal which results in a considerable loss in transparency.

In order to overc-ome this problem, conductive and transparent electrode coatings are conventionally applied to thin glass substrates which are subsequently cemented to both sides of the KDP crystal. However, this method is not entirely satisfactory. This is because bubbles develop in the cement upon prolonged application of voltages to the switch. This makes frequent replacement of the electro-optic switches necessary.

Switch 10 has a thin inert transparent insulator film 12 of sputtered quartz or glass on the sides of KDP crystal 14. Electrodes 16 and 18 which overlie film 12 are transparent conductive layers. The latter are preferably applied by vacuum deposition techniques, such as incomplete reactive sputtering.

The resultant switch structure prevents the formation of bubbles between the crystal and electrodes. Further, complete encapsulation of the KDP crystal with glass or quartz prevents degradation of the crystal by water vapor moisture, etc.

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