Patent ID: 6771412
Filing Date: 2004-08-03
Classification: G02F

Abstract:
An acousto-optical device comprising a body and an acoustic transducer;said body comprising a first end, said first end having a first central point; a second end, said second end having a second central point; and, an axis, said axis being perpendicular to said first end and extending from said first central point to said second central point; said acoustic transducer being attached to said body; wherein any cross-section of said body, cut perpendicular to said axis, defines a plane geometrically similar to said first end, wherein said body tapers from said first end to said second end, wherein said body is manufactured from optical material, wherein, along any line drawn perpendicular to said axis, the index of refraction of said optical material decreases as the distance from said axis increases along said line, and wherein said acoustic transducer is placed in the electromagnetic field of a cylindrical metal cavity in which a rotating resonator mode is excited by means of a directional coupler.