Patent ID: 7079563

Claim:
A semiconductor laser device for emitting a plurality of laser beams having different wavelengths, said device comprising: a first laser oscillation section having a plurality of first semiconductor films formed on a semiconductor substrate and having a predetermined specific area; and a second laser oscillation section having a plurality of second semiconductor films and having a smaller specific area than the first laser oscillation section, wherein the first laser oscillation section's one surface located away from the semiconductor substrate and the second laser oscillation section's one surface located close to its light emitting portion are bonded together by virtue of an adhesion layer having an electric conductivity, wherein the second laser oscillation section includes III–V compound semiconductor containing any one of arsenic (As), phosphorus (P) and antimony (Sb) as group V element or II–VI compound semiconductor, wherein said adhesion layer contains metal component and serves as a common electrode for said laser oscillation sections, wherein said semiconductor laser device further comprises a metal-diffusion preventing film for preventing metal diffusion between said adhesion layer and at least one of said semiconductor films.