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