Technique for electronically stabilizing the ouputs of acoustoop

Details Technique for electronically stabilizing the ouputs of acoustoop Technique for electronically stabilizing the ouputs of acoustoop

1997-01-23

1998-04-21

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359305, 359298, G02F 111

Patent

active

057424250

ABSTRACT:
A technique of stabilizing the output of an acoustooptic modulator. A laser passes a light beam through the acoustooptic modulator. A driver circuit connects to a drive electrode of the acoustooptic modulator. RF generators deliver drive power at a first carrier frequency and compensation power at second and third carrier frequencies, one higher and the other lower than the first carrier frequency. The driver circuit modulates the drive power and the compensation power such that compensating acoustic energy induced in the acoustooptic modulator complements drive acoustic energy, and the spatial content of the drive acoustic energy. The combined drive power and the complementing compensating power maintain the spatial thermal energy distribution inside the acoustooptic modulator substantially constant. Consequently, beam steering and thermal ellipticity are stabilized and remain substantially constant throughout the operating range of the modulator.

REFERENCES:
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patent: 5008851 (1991-04-01), Brandstetter et al.
patent: 5247388 (1993-09-01), Anderson et al.
patent: 5363221 (1994-11-01), Sutton et al.
patent: 5452314 (1995-09-01), Aronson

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