The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 2002
Filed:
Sep. 15, 1999
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A semiconductor laser module comprising a semiconductor laser device having an emitting surface from which excited light is emitted and a reflecting surface opposite to the emitting surface, and an optical feedback medium for feeding most of optical power emitted from the emitting surface of the semiconductor laser device back to the semiconductor laser device by coupling means and emitting part of the optical power. The semiconductor laser device has a low reflectance multilayer coating formed on the emitting surface and having a reflectance of 10 to 10%. The low reflectance multilayer coating has a reflection spectrum in the form of a curve having a maximum value at the central wavelength of reflection and minimum values on both sides of the central wavelength of reflection.