Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1986-02-10
1991-04-09
Buczinski, Stephen C.
Amplifiers
Parametric amplifiers
Semiconductor type
307425, 350354, 356347, 356 5, H01S 300, H03F 700, G02B 523
Patent
active
050068130
ABSTRACT:
A nonlinear optical receiver includes a source of coherent light of frequency .omega. for illuminating a spatial region. The portion of the source light which is reflected from objects within the spatial region constitutes a signal beam. A reference beam of coherent light of frequency .omega. is also provided. A photorefractive element receives the signal and reference beams and amplifies the signal beam by two-wave mixing.
The receiver may include a first polarizer, having a first polarization direction, placed between a cubic photorefractive element and the signal and reference beams, and a second polarizer, having a second polarization direction perpendicular to the first polarization direction, placed so that the amplified signal beam must pass therethrough. A frequency shifting element, such as a Bragg cell modulator, is used to change the frequency of the reference beam. pa A first laser may provide both the source of coherent light and the reference beam of coherent light, or a first laser may provide the source of coherent light while a second laser provides the reference beam of coherent light. The photorefractive element may be a cubic photorefractive crystal or a nonlinear optic material. A two dimensional focal plane array may be added for detecting the amplified signal beam.
REFERENCES:
patent: 4198162 (1980-04-01), Bjorklund et al.
patent: 4390991 (1983-06-01), Pearson
patent: 4413905 (1983-11-01), Holzapfel
patent: 4492468 (1985-01-01), Huignard et al.
patent: 4500855 (1985-02-01), Feinberg
Khoshnevisan Mohsen
Yeh Pochi A.
Buczinski Stephen C.
Deinken John J.
Rockwell International Corporation
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