Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-07-17
1988-09-27
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369284, 369286, 365113, 365114, 365127, 346137, G11B 700, G11B 722
Patent
active
047747021
ABSTRACT:
A portion of a chalcogenide transformation film in a less reflective phase responds to a low energy laser beam writing pulse by transforming to a crystalline phase. A marmem alloy, secured to the bottom side of the film, responds to a longer erasing pulse of a lower energy laser beam at the same portion by physically stressing the film only at that same portion. The film portion responds to the physical stress by transforming back to a less reflective phase. An optical reader interprets the crystalline phase as a digital logic "1", and the less reflective phase as a digital logic "0".
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"Reversible Recording of Holograms in Glassy Chalcogenide Semiconductors in Elevated Temperatures"; Kaincitouskii et al., 800.J. Quant. Electron, vol. 6, No. 1, Jan. 1976, p. 121.sup.+.
"Injection Laser Writing on Chalcogenide Films"; Smith, Applied Optics, vol. 13, No. 4, Apr. 1974, pp. 795-798.
LTV Aerospace and Defense Company
Psitos Aristotelis M.
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