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:
Dec. 22, 1992
Filed:
Sep. 09, 1991
Yoshihiro Kokubo, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor laser device having an active region with a wide and uniform width which supports propagation of fundamental and higher modes of oscillation includes a reflecting film coating having a reflectivity smaller than a reflectivity determined by the differences between the refractive index of the semiconductor that forms the active layer and air and having no spatial distribution of reflectivity in the direction of the width of the active region disposed on an emitting facet of the laser, and a reflecting film coating having a highest reflectivity at the center of the width of the active region, the reflectivity decreasing at the sides of the center, disposed on the facet opposite to the emitting facet. As a result, a semiconductor laser oscillating in the fundamental mode with high power light output is provided.