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. 10, 1990
Filed:
Mar. 13, 1989
Yoichiro Ota, Itami, JP;
Tetsuya Yagi, Itami, JP;
Abstract
A semiconductor laser device includes an active layer, a pair of different conductivity type cladding layers having a wider energy band gap than that of the active layer, sandwiching the active layer. One of the cladding layers has a stripe ridge or stripe groove. A high dopant concentration diffusion region having the same conductivity type as that of the cladding layer is disposed on the stripe ridge or the stripe groove. Therefore, a refractive index difference is provided in the two directions transverse to the length of the resonant cavity and a low astigmatism. Furthermore, because the light confinement is strengthened, the light emission efficiency is also enhanced.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile