Patent
1986-07-02
1987-11-10
Punter, William H.
350358, G02B 520, G02F 111
Patent
active
047053623
ABSTRACT:
An acousto-optic tunable filter configuration and a method for the operation thereof, whereby the tuning range is extended. A non-collinear acousto-optic tunable filter crystal has a first transducer bonded to one transducer face of the crystal and a single transducer bonded on the opposite crystal face which crystal face is cut so as to be parallel to the first transducer. The first transducer operates at a center frequency f.sub.1 and the second transducer operates at a center frequency f.sub.2. By launching acoustic waves having a center frequency f.sub.1 into the crystal from the crystal's first side acoustic waves propagate in a first direction such that the interaction of the acoustic wave with the light results in the absorption of a phonon. Acoustic waves having a center frequency f.sub.2 are launched into the crystal from the crystal's second side and propagate in a second direction which is anti-parallel to the first direction such that the interaction with the light by the second series of acoustic waves results in the stimulated emission of a phonon.
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Feldman Donald W.
Gottlieb Milton
Ryan Frederick M.
Punter William H.
Westinghouse Electric Corp.
Yatsko M. S.
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