Surface acoustic wave devices for controlling high frequency sig

Details Surface acoustic wave devices for controlling high frequency sig Surface acoustic wave devices for controlling high frequency sig

1993-10-08

1995-05-23

Healy, Brian

Optical waveguides

Directional optical modulation within an optical waveguide

Acousto-optic

385130, 385132, 385141, 385142, 359285, 359298, 310313R, 310313B, G02B 610, H01L 4104

Patent

active

054188660

ABSTRACT:
Devices for controlling high frequency signals such as optic or electric signals are disclosed which utilize guided and/or reflected surface acoustic waves. The devices preferably use crystalline substrates modified (e.g., by ion exchange to increase mass density) to contain acoustic reflectors and/or continuous acoustic waveguiding channels (optionally, in combination with optical features such as optical waveguiding channels) and interdigital transducers deposited thereon to provide frequency generation (and reception where high frequency electrical signals are controlled). The preferred crystal substrates are of a material having a piezoelectric-elastic dielectric matrix capable of the generation of acoustic waves, such as MTiOXO.sub.4 (where M is K, Rb, Tl, and/or NH.sub.4 and X is P and/or As) having mm2 symmetry.

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