| 摘要 |
A semiconductor laser device comprises: an active layer; a cladding layer of a first conductivity type; an insulating film; a first electrode ; and a pad electrode provided on the first electrode. The cladding layer is provided above the active layer, and has a ridge portion constituting a striped waveguide and non-ridge portions adjacent to both sides of the ridge portion. The insulating film is covering side faces of the ridge portion and an upper face of the non-ridge portions. The first electrode has a gap portion provided above the non-ridge portions. The pad electrode is provided on the first electrode.
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