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Textured PbMoO(4) Films for Acousto-Optic Applications

IP.com Disclosure Number: IPCOM000075177D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Guerci, CF: AUTHOR [+2]

Abstract

A technique is presented for fabrication of PbMoO(4) of texture c-axis perpendicular to film, for acousto-optic application in devices such as switches, modulators, correlators and scanners.

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Textured PbMoO(4) Films for Acousto-Optic Applications

A technique is presented for fabrication of PbMoO(4) of texture c-axis perpendicular to film, for acousto-optic application in devices such as switches, modulators, correlators and scanners.

An interesting material for acousto-optic applications is reported in the literature to be PbMoO(4) in view of the combination of following useful properties: 1) High acousto-optic figure of merit.

2) Low acoustic and optic losses.

3) Easy crystal growth.

4) Favorable mechanical impedance for acoustic matching.

5) The absence of optical damage effects.

It has also been pointed out that the c-axis of the tetragonal PbMoO(4) crystal is the most useful direction with respect to device applications. This cut,
i.e., c-axis perpendicular to the plane of the film, has the unusual property that with a longitudinal acoustic wave propagating along the c-axis and a light beam propagating near the a-axis, the acousto-optic interaction is large and independent of the optical polarization state. Such insensitivity to polarization is desirable for devices which operate with unpolarized sources and can be used to considerable advantage in x-y light deflection systems.

Literature on the bulk PbMoO(4) crystal points out the need for (004) single crystal and textured films for acousto-optic device applications. This technique for preparing PbMoO(4) films with the desired orientations uses radio-frequency sputtering. The starting point was a...