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. 06, 2004
Filed:
Feb. 20, 2001
Applicant:
Inventors:
John Haig Marsh, Glasgow, GB;
Craig James Hamilton, Renfrewshire, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 5/00 ;
U.S. Cl.
CPC ...
H01S 5/00 ;
Abstract
There is disclosed an improved semiconductor laser device ( ), eg a single mode index guided laser diode. The device ( ) comprises: an optical waveguide ( ); at least one electrical contact ( ) extending along part of a length of the waveguide ( ); and wherein the at least one electrical contact ( ) is shorter than the optical waveguide ( ). By this arrangement a part or parts of the waveguide ( ) are not electrically pumped, in use.