1982-02-02
1985-03-19
Arnold, Bruce Y.
350 11, G02F 111
Patent
active
045055505
ABSTRACT:
An improved infrared acousto-optic tunable filter is provided by an acousto-optic birefringent crystal having polished, uncoated input and output faces normal to the radiation incident-on or diffracted-by the crystal, respectively, and wherein crystallographic axis is oriented at about 21 degrees to the incident infrared radiation, rf transducer means coupled to the crystal for tuning or selecting a narrow bandwidth infrared wavelength of interest, and input and output wire grid polarizer are aligned with the crystal. The input wire grid polarizer is aligned to polarize the input infrared radiation in the same plane as the plane of the b-c crystalline axes of the crystal. The output wire grid polarizer is disposed with the parallel conductors aligned transversely to the conductors of the input polarizer, so that only the selected or tuned bandwidth of interest is transmitted through the output polarizer.
REFERENCES:
patent: 3632193 (1972-01-01), Kusters
Dixon, R. W., "Acoustic Diffraction of Light in Anistropic Media", IEEE Journal of Quantum Electronics QE-3, 85 (1967).
Harris, S. E., et al., "Acousto-Optic Tunable Filter", JOSA, vol. 59, No. 6, Jun. 1969, pp. 744-747.
Gottlieb, M. et al., "Acousto-Optic Properties of Some Chalcogenide Crystals", Journal of Applied Physics, vol. 45, No. 12, pp. 5145-5151, Dec. 1974.
Chang, I. C., "Laser Detection Utilizing Tunable Acoustooptic Filters", IEEE J. of Quantum Electronics, vol. 14, No. 2, Feb. 1978.
Gottlieb, J. D., et al., "Recent Developments in Infrared Acousto-Optic Tunable Filters", Westinghouse R and D Center.
Arnold Bruce Y.
Trempus T. R.
Westinghouse Electric Corp.
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