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:
Jul. 11, 1989
Filed:
Jul. 07, 1988
Applicant:
Inventor:
Yuji Ohkura, Itami, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 96 ; 372 32 ;
Abstract
In a single wavelength oscillation semiconductor laser having a diffraction grating at the active region, the coupling coefficient between the light and the diffraction grating is low within the laser and high in the neighborhood of the resonator end surface. The amplitude of the diffraction grating is low within the laser and high in the neighborhood of the resonator end surface, or the active layer or the guide layer is thick within the laser and thin in the neighborhood of the resonator end surface. Thus, the laser oscillates at a single wavelength even at high power output operation.