Acoustic-optic coherent modulator and detection system

Details Acoustic-optic coherent modulator and detection system Acoustic-optic coherent modulator and detection system

1978-04-17

1980-08-12

Sikes, William L.

Oscillators

Relaxation oscillators

331 945M, 350149, G02F 133

Patent

active

042170362

ABSTRACT:
The intensity of light beams transmitted through a tunable acousto-optic modulator is controlled by modulating the center wavelength of the filter passband. Such wavelength modulation can be obtained by modulation of the acoustic frequency or the crystal birefringence. An acousto-optic modulator of this type is sensitive to the temporal coherence of the light beam. When used in an optically coherent detection system, it can provide detection of very weak laser beams in the presence of strong incoherent background radiations.

REFERENCES:
patent: 3632193 (1972-01-01), Kusters
patent: 3679288 (1972-07-01), Harris
patent: 3701584 (1972-10-01), Runge
patent: 4052121 (1977-10-01), Chang
Harris et al., Acousto-Optic Tunable Filter, JOSA, vol. 59, No. 6, (Jun. 1969), pp. 744-747.
Chang, Noncollinear Acousto-Optic Filter With Large Angular Aperture, Appl. Phys. Lett., vol. 25, No. 7, (Oct. 1, 1974), pp. 370-372.
Wiczer et al., Influence of Electrostatic Fields on the Properties of Acoustically Tuned Optical Filters, Appl. Phys. Lett., vol. 30, No. 9, (May 1, 1977), pp. 439-441.

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