Coherent light generators – Particular active media – Semiconductor
Patent
1994-04-06
1995-08-08
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
257 79, 257100, 257632, H01S 319
Patent
active
054405750
ABSTRACT:
Disclosed are high reliability semiconductor lasers that need not be maintained inside a hermetic enclosure. Such lasers can advantageously be used in a variety of applications, e.g., in optical fiber telecommunications, and in compact disc players. Such "non-hermetic" lasers comprise facet coatings that comprise a dielectric layer that has very low water saturation value. In preferred embodiments this dielectric layer is SiO.sub.x (1.ltoreq.x<2), deposited by a molecular beam method. Deposition conditions are selected to result in a dense material that is largely free of particulates and blisters, and is substantially impermeable to moisture. Among the deposition conditions is substantially normal beam incidence, and a relatively low deposition rate. Deposition is advantageously carried out under relatively high vacuum conditions. A quantitative method of determining the water level in a SiO.sub.x film is disclosed.
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Chand Naresh
Comizzoli Robert B.
Osenbach John W.
Roxlo Charles B.
Tsang Won-Tien
AT&T Corp.
Davie James W.
Pacher Eugen E.
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