Information recording methods using lasers

Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element

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Details

2503161, 346 76L, 346135, 346151, 274 46A, 427 53, 430320, 430396, 430DIG945, 358128, 350274, 350320, G01D 1534, G01D 1510

Patent

active

042388031

ABSTRACT:
A thin film is formed on a substrate, which film is made of a substantially amorphous chalcogenide having a composition of As.sub.x .multidot.Te.sub.y .multidot.Se.sub.z .multidot.G.sub.g, where G represents at least an element selected from a group consisting of S, In, Tl, Sn, Pb and Ge, and where 10 at %.ltoreq.x.ltoreq.25 at %, 50 at %.ltoreq.y.ltoreq.88 at %, 0 at %.ltoreq.z.ltoreq.40 at % and 0 at %.ltoreq.g.ltoreq.10 at %, and that x+y+z+g=100 and z+g.noteq.0. A laser beam is projected onto the thin film to form in it recesses representing information carried by the laser beam. The information recorded in the thin film exhibits a high signal-to-noise ratio and a high .gamma. characteristic. Besides, the recorded information is scarcely subjected to deterioration independently from time elapse.

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