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:
May. 03, 2005
Filed:
Jul. 31, 2002
Koji Makita, Akou, JP;
Hideto Adachi, Okayama, JP;
Toshiya Kawata, Okayama, JP;
Hiroshi Asaka, Hirakata, JP;
Osamu Imafuji, Takatsuki, JP;
Toshiya Fukuhisa, Matsubara, JP;
Akira Takamori, Suita, JP;
Koji Makita, Akou, JP;
Hideto Adachi, Okayama, JP;
Toshiya Kawata, Okayama, JP;
Hiroshi Asaka, Hirakata, JP;
Osamu Imafuji, Takatsuki, JP;
Toshiya Fukuhisa, Matsubara, JP;
Akira Takamori, Suita, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A semiconductor laser has a first conduction-type cladding layer, an active layer, and a second conduction-type cladding layer formed on a first conduction-type semiconductor substrate. The second conduction-type cladding layer has a mesa-type stripe-shaped recessed portion in at least four spots, so as to form a central ridge portion, which constitutes a ridge-type current confinement portion, and two or more lateral ridge portions, which are positioned on both sides of the central ridge portion, have a height larger than to that of the central ridge portion, and include the second conduction-type cladding layer. An insulation film with a lower refractive index than the second conduction-type cladding layer is formed in a pair of stripes disposed respectively in the regions from the side surface of the second conduction-type cladding layer on both side surfaces of the central ridge portion toward the outside. The insulation film is not formed on the central ridge portion.