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:
Sep. 19, 1989
Filed:
Aug. 23, 1988
Applicant:
Inventors:
Yoshito Seiwa, Itami, JP;
Toshitaka Aoyagi, Amagasaki, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ; 372 45 ; 372 48 ;
Abstract
A semiconductor laser includes an active region which includes a portion having a refractive index distribution with a relatively samll refractive index difference which allows only the fundamental mode of the transverse modes in the neighborhood of the light output facet. The other region of the active region has a refractive index distribution with a large refractive index difference which allows the fundamental mode as well as higher order modes.