Accession Number : ADD012125

Title :   Semiconductor Laser End-Facet Coatings for Use in Solid or Liquid Environments.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Garcia,Graham A ; Cowen,Steven J

Report Date : 09 Apr 1985

Pagination or Media Count : 4

Abstract : An improvement for a semiconductor laser allows the facet reflectivity to be modified to compensate for the presence of a liquid or transparent solid medium having an index of refraction n sub m. A first dielectric coatings is disposed on an end-facet of the semiconductor laser and has an index of refraction n sub 1. A second dielectric coating is disposed on the first dielectric coating and has an index of refraction n sub 2. The materials of the dielectric coatings are selected such that the fraction (n sub 1)/(n sub 2) = square root of (n sub m). Thus the problems associated with reduction of laser facet reflectivity due to being in contact with a surrounding medium which optically is very different from air is overcome.

Descriptors :   *PATENTS, *SEMICONDUCTOR LASERS, *OPTICAL COATINGS, DIELECTRICS, REFLECTIVITY, MODIFICATION, REFRACTIVE INDEX

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE