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:
Dec. 25, 2001
Filed:
Dec. 18, 1998
Katsunori Abe, Chita-gun, JP;
Kinya Atsumi, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
An active layer in which laser light is generated by injecting driving current therein is sandwiched between semiconductor layers. The active layer has a multi-quantum-well structure, and the layers located at both sides of the active layer are made of an AlGaAs-based material. Refractive indices of the layers are set asymmetrically with respect to the active layer by properly selecting aluminum-mixing ratios in AlGa. Since the light generated in the active layer is distributed more in a layer having a higher refractive index, a peak of the light distribution is shifted from the active layer into the layer having a higher refractive index. Thus, energy concentration to the active layer is avoided. A thickness of the layer having a higher refractive index may be made thicker to further enhance the energy concentration shift from the active layer.