Methods and apparatus for recording electric signals

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350356, 350387, 358293, 346108, G01D 1514

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043120040

ABSTRACT:
Electric signals are recorded on a recording medium having a light sensitivity extending to wavelengths shorter than 475 nm, with an array of electrically switched lanthanum modified lead zirconate titanate (PLZT) light gates located between a light polarizer and a complementary light analyzer. The light gates are illuminated through the polarizer with light whose wavelength essentially is longer than 475 nm. Such light is selectively gated through electrically switched light gates through the analyzer and to the recording medium having a light sensitivity extending to wavelengths shorter than 475 nm. Information recordings may be made in this manner over extended periods of time without the typical performance degradation through photoinduced birefringence observed with conventionalPLZT electrooptic shutters.

REFERENCES:
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patent: 3930119 (1975-12-01), Schmidt
patent: 3990770 (1976-11-01), Carl
patent: 4025189 (1977-05-01), Pugsley
Cutchen et al.; PLZT Electrooptic Shooters: Applications; Wescon Technical Papers, vol. 17, part 30, 1973, pp. 30/2 1-12.
Micheron et al.; Holographic Storage in Quadratic PLZT Ceramics, Journal of American Ceramic Society, vol. 57, No. 7, pp. 306-308.
Micheron et al.; Optical Recording of Digital Data in PLZT Ceramics, applied Physics Letters, vol. 24, No. 12, Jun. 1974, pp. 605-607.
Rouchon et al.; Photoinduced Caanbes of Refractive Index in PLZT Ceramics; Ferroelectrics; vol. 11, 1976, pp. 389-392.
Krumins et al.; Optically Induced . . . Ceramics; Ferroelectrics; vol. 18, 1978, pp. 21-26.
Kamzina et al.; Photoinduced Phenomenain . . . Transition; Ferroelectrics, vol. 18, 1978, pp. 113-116.
Levanyuk et al.; Theory of Photoinduced Changes . . . Polarization Ferroelectrics, vol. 18, 1978, pp. 147-151.
Cotchen et al.; PLZT Electrooptic Sautters: Applications Applied Optics; vol. 14, No. 8, Aug. 1975, pp. 1866 Et. Seq.

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