Modified multi-channel Bragg cell using a phased array structure

Details Modified multi-channel Bragg cell using a phased array structure Modified multi-channel Bragg cell using a phased array structure

1989-03-13

1990-10-09

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

330 43, G02F 133

Patent

active

049623826

ABSTRACT:
A high signal reception efficiency, multi-channel Bragg cell is provided for an interferometric acoustooptic signal processor. The Bragg cell comprises a block of acoustooptic material which is illuminated on one block surface by a laser beam. A plurality of sets of electroacoustic transducers are mounted on another surface of the block which is normal to the first block surface and each transducer set is responsive to the output of a different one of a plurality of antennae so that the laser beam is acoustooptically modulated by the signal outputs from the antennae as it passes through the block. The transducers are arranged in a phased array comprising the plurality of transducer sets. A Fourier transform lens receives and focusses the modulated beam from the block to produce a two dimensional display which represents the power spectrum of the antennae outputs as a function of the angles of incidence of the antennae with respect to an incoming electromagnetic wavefront.

REFERENCES:
patent: 4634230 (1987-01-01), Spezio
patent: 4671620 (1987-06-01), Yao
patent: 4802149 (1989-01-01), Moore
J. P. Y. Lee, "Interferometric Acoustooptic Signal Processor for Simultaneous Direction Finding and Spectrum Analysis", Applied Optics, vol. 22, No. 4, pp. 867-872, Mar. 15, 1983.
L. Bademian, "Parallel-Channel Acousto-Optic Modulation", Optical Engineering, vol. 25, No. 2, pp. 303-308, Feb. 1986.
J. M. Bagshaw and T. F. Willats, "Anisotropic Bragg Cells", the GEC Journal of Research, vol. 2, No. 2, pp. 96-103, 1984.

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