G - Physics – 02 – B
Patent
G - Physics
02
B
345/57
G02B 5/20 (2006.01)
Patent
CA 1261955
ABSTRACT OF THE DISCLOSURE The invention provides an acousto-optic tunable filter configuration and a method for the operation of such an apparatus in which the tuning range is extended. According to the new configuration, 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 is fabricated to the proper thickness to operate at a center frequency f1 and the second transducer is fabricated so as to operate at a center frequency f2. The method of extending the tuning range of the acousto-optic tunable filter comprises the steps of: introducing incident light into the acousto- optic tunable filter which filter comprises a crystal having an optical input face, an optical output face and first and second parallel sides. Launching acoustic waves having a center frequency f1 into the crystal from the crystal's first side. These 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 f2 are launched into the crystal from the crystal's second side. The acoustic waves of a center frequency f2 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.
501294
Feldman Donald W.
Gottlieb Milton
Ryan Frederick M.
Oldham And Company
Westinghouse Electric Corporation
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