Constant power density acoustic traveling wave lens

Details Constant power density acoustic traveling wave lens Constant power density acoustic traveling wave lens

1999-01-22

2000-03-28

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359313, 359305, 385 7, G02F 133

Patent

active

060439246

ABSTRACT:
An acoustic traveling wave lens structure for an acousto-optic scanner comprises a confined height fluid-containing channel, upon which a scanned optical beam to be modulated by a acoustic traveling wave is incident. The channel is bounded by spaced-apart walls that extend between a first end of the scanner channel, to which an acoustic transducer is coupled, and a second end of the channel that terminates an acoustic traveling wave launched from the acoustic transducer. The thickness of the channel is linearly tapered from the first end to the second end, so as to maintain a constant acoustic power density. To compensate for the attenuation in acoustic power through the water medium, the waveguide may be heated, to maintain the temperature of the liquid medium (water) within the waveguide channel within a prescribed temperature range over which the acoustic velocity remains substantially constant or undergoes a relatively small variation.

REFERENCES:
patent: 3676592 (1972-07-01), Foster
patent: 5801874 (1998-09-01), Montgomery et al.

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