Electro-optic modulator with improved acousto-optic suppression,

Details Electro-optic modulator with improved acousto-optic suppression, Electro-optic modulator with improved acousto-optic suppression,

1978-07-20

1980-10-21

Sikes, William L.

Oscillators

Relaxation oscillators

331 945M, H01S 3098

Patent

active

042290791

ABSTRACT:
An improved electro-optic moduator device is disclosed which provides strain-free mounting of an electro-optic crystal within a housing assembly and suppression of acousto-optic effects within the crystal. An acoustic matching liquid having an acoustic impedance substantially matching the acoustic impedance of the electro-optic crystal is disposed within the housing enveloping longitudinally the crystal. The acoustic matching liquid effectively suppresses the acousto-optic resonances within the crystal by coupling the acoustic energy out of the crystal into the liquid. The liquid enveloping the crystal also provides a uniform heat conduction path for minimizing thermal gradient variations and the resulting thermally induced strain within the crystal. A zinc oxide suspension in silicone oil is an exemplary acoustic matching liquid for gallium arsenide or cadmium telluride crystals. In one embodiment the acoustic matching liquid has a consistency of a slurry capable of being recirculated through the housing to improve the heat transfer characteristics of the liquid. In a further embodiment an acoustic absorber, disposed in a spaced apart relationship about the crystal, is adapted for absorbing acoustic energy transmitted through the liquid. An elastomeric seal at each end of the crystal provides a liquid-tight seal between the housing and the crystal to maintain the liquid within the housing and provides a soft-mounting structure to minimize thermally and mechanically induced strain within the crystal.

REFERENCES:
patent: 3454325 (1969-07-01), Ohm
patent: 3653743 (1972-04-01), Kiefer et al.
patent: 3663091 (1972-05-01), Lee

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