Modified tunable acousto-optic filter
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United States of America Patent
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May 25, 2004
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N/A
app pub date -
Nov 8, 2002
filing date -
Nov 8, 2002
priority date (Note) -
Expired
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Abstract
Acousto-optical filter systems for filtering a light beam by generating undiffracted and diffracted light beams within a birefringent crystal and by suppressing the diffracted beam within or at a face of the crystal. Where the two beams are noncollinear, an aperture provides diffracted beam suppression. Where the two beams have different polarization directions, the diffracted beam is suppressed by a polarization analyzer, internal reflection of each beam at a Brewster angle at the surface, total internal reflection of the diffracted beam at the surface, or a suitably oriented multilayer thin film at the surface. Variation of the acoustic frequency provides tunability of the filter.
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