Patent ID: 7371595

Claim:
A method for manufacturing a semiconductor laser device comprising: sequentially laminating, on a substrate, at least a first-conductive-type cladding layer, an active layer, a second-conductive-type first cladding layer, an etching stop layer, a second-conductive type second cladding layer, a second-conductive-type intermediate band gap layer and a second-conductive-type cap layer; etching part of the second-conductive-type cap layer, the second-conductive-type intermediate band gap layer and the second-conductive-type second cladding layer; side-etching the second-conductive-type cap layer; etching the second-conductive-type second cladding layer and forming a ridge stripe structure having a protruding portion of the second-conductive-type intermediate band gap layer; and etching and removing the protruding portion formed when etching the second-conductive-type second cladding layer, the protruding portion being such that the second-conductive-type intermediate band gap layer protrudes in a direction substantially perpendicular to a lamination direction from the second-conductive-type second cladding layer and the second-conductive-type cap layer, wherein the-etching and removing of the protruding portion includes: coating outer peripheral portions facing the second-conductive-type intermediate band gap layer of the second-conductive-type second cladding layer and the etching stop layer with a resist, and etching the second-conductive-type intermediate band gap layer and the second-conductive-type cap layer, wherein the second-conductive-type second cladding layer is not removed.