Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yoshiyuki Itoh0
Hideo Shiozawa0
Koichi Gen-Ei0
Osamu Horiuchi0
Akio Makuta0
Akira Tanaka0
Date of Patent
May 22, 2007
0Patent Application Number
108456660
Date Filed
May 13, 2004
0Patent Primary Examiner
Patent abstract
A semiconductor laser device comprises: a cladding layer of a first conductivity type; an active layer provided on the cladding layer; and a cladding layer of a second conductivity type provided on the active layer. At least a part of the cladding layer of the second conductivity type has a ridge stripe. The ridge stripe includes: an upper part having substantially vertical sidewalls; and a lower portion having sidewalls inclined so that the stripe becomes wider toward the active layer.
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