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:
Apr. 15, 1997
Filed:
Oct. 14, 1993
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 45 ; 372 43 ; 372 48 ; 438 33 ; 438 42 ; 438964 ;
Abstract
A semiconductor laser such as a laser diode includes a semiconductor substrate and a laser diode region disposed on said semiconductor substrate and having a laser beam emission end. The semiconductor substrate has a front surface directly below said laser beam emission end, said front surface being retracted from said laser beam emission end. The front surface may be formed as an optically roughened surface as a side wall surface of a groove when the groove is defined in the semiconductor substrate by dicing. The laser diode region includes an active layer of GaAs or AlGaAs. The front surface may further be optically roughened by etching or sputtering.