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:
Aug. 28, 1979
Filed:
Aug. 15, 1977
Applicant:
Inventors:
Martin B Small, Mohegan Lake, NY (US);
Peter S Zory, Jr, Ossining, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
331 / ; 357 18 ;
Abstract
In a heterostructure diode injection laser, the active layer has a region of relatively lesser thickness in registration with a stripe geometry contact. Increased gain within the region of lesser thickness relative to adjacent regions of greater thickness tends to effectively confine lasing operation to the thinner or constricted region. The dimensions of the constricted active region may be readily selected to discriminate against multifilament lasing modes in order to produce a single spot laser beam over a wide range of injection levels.