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:
May. 25, 1976
Filed:
Sep. 19, 1974
Applicant:
Inventor:
Frederick David King, Smith Falls, CA;
Assignee:
Northern Electric Company Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ; H01L / ;
U.S. Cl.
CPC ...
357 18 ; 357 16 ; 357 17 ; 331 / ;
Abstract
A variable stripe width semiconductor laser is provided in which, in addition to the contact stripe and back contact, a third contact is provided. By applying a positive bias to the third contact the current spread in the device is reduced, increasing the effective current density at the lasing position. By varying, or pulsing, the applied position bias the current density can be caused to vary above and below a threshold and switch the laser on and off. Further, by application of a suitable positive bias, unwanted higher order modes can be eliminated.