Noncollinear tunable acousto-optic filter

Details Noncollinear tunable acousto-optic filter Noncollinear tunable acousto-optic filter

1975-09-10

1977-10-04

Corbin, John K.

350161W, G02F 133, G02B 520

Patent

active

040521214

ABSTRACT:
An electronically tunable optical filter is described wherein an optical beam is diffracted by an acoustic beam the group velocity of which is noncollinear with the optical beam transmitted through the birefringent crystal medium. The frequency and the direction of the phase velocity of the acoustic wave are chosen for a given incidence direction of the optical beam so that the diffraction occurs for a band of optical frequencies centered about a predetermined optical frequency and a relatively large angular distribution of incident optical beams. The noncollinear acousto-optic filter has the following advantages: (i) it allows very simple coupling of optical and acoustic beams into the interaction medium, (ii) it allows the use of multiple transducers for increasing tuning range or varying resolution, (iii) it allows a broad class of crystals to be used as filter material, (iv) it has a large degree of freedom in the filter design for optimizing efficiency or angular aperture and throughput, realizing narrow or broad optical passband and (v) it provides the spatial separation of incident and transmitted light through the filter and thus can be operated without the use of polarizers.

REFERENCES:
patent: 3502879 (1970-03-01), Vallese
patent: 3679288 (1972-07-01), Harris
patent: 3698792 (1972-10-01), Kusters
patent: 3944334 (1976-03-01), Yano et al.
patent: 3944335 (1976-03-01), Saito et al.
patent: 3953107 (1976-04-01), Yano et al.
Dixon, R. W., "Acoustic Diffraction of Light in Anisotropic Media," IEEE Jr. of Quantum Electronics, QE-3, 1967, pp. 85-93.
Yano et al., "New Noncollinear Acousto-Optic Tunable Filter Using Birefringence in Paratellurite," Applied Optics Letters, vol. 24, 3-15-74, pp. 256-258.

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