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:
Nov. 29, 1988
Filed:
Feb. 18, 1986
Applicant:
Inventors:
Yasunori Tokuda, Amagasaki, JP;
Kenzo Fujiwara, Amagasaki, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 45 ; 372 46 ; 372 50 ;
Abstract
At least a portion of the optical waveguide is formed in a superlattice structure or in a quantum well structure, and crystals are mixed in the portions of the superlattice structure or the quantum well structure that divide the resonator to decrease the refractive index of these portions, in order to form two or more laser portions having different cavity lengths. The semiconductor device can be formed easily and precisely without employing cleavage which involves cumbersome manufacturing steps. Further, the crystal need not be grown on the groove but may simply be grown on a flat surface, making it possible to easily and precisely produce the semiconductor laser device.