Patent
Method and apparatus for control of light transmission through an anisotropic medium
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TLDR
In this paper, an electronically tunable acousto-optic filter is disclosed of the type wherein light of a first polarization is diffracted on an acoustical wave traveling collinearly of the light in an anisotropic birefringent medium to shift the polarization of the first polarization to a second polarization.Abstract:
An electronically tunable acousto-optic filter is disclosed of the type wherein light of a first polarization is diffracted on an acoustical wave traveling collinearly of the light in an anisotropic birefringent medium to shift the polarization of the light from a first polarization to a second polarization. The intensity of the acoustic wave in the birefringent medium is varied to vary the ratio of the intensity of the light diffracted from the first polarization into the second polarization. The band pass of the acousto-optic filter is electronically tuned by varying the frequency of the acoustic wave in the birefringent medium. The acousto-optic device may be employed as an attenuator, chopper, or modulator for light.read more
Citations
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References
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Journal ArticleDOI
Acoustic diffraction of light in anisotropic media
TL;DR: In this paper, the Bragg formalism was generalized to include diffraction in anisotropic media, and experiments were conducted using optical diffraction from longitudinal and transverse acoustic waves in crystal quartz and in sapphire.
Journal ArticleDOI
Electronically tunable acousto‐optic filter
TL;DR: In this article, a tunable optical filter with a band pass of less than 2 A, a corrected peak transmission of 50%, and an average skirt rejection ratio of about 45 dB have been obtained.