Patent ID: 8098704

Claim:
A semiconductor laser apparatus comprising: a first semiconductor laser device, a second semiconductor laser device, and a third semiconductor laser device, said first semiconductor laser device comprising a first semiconductor layer having a first emission point emitting a light beam having a first wavelength in a direction substantially parallel to a first direction on a first substrate, said second semiconductor laser device comprising a second semiconductor layer having a second emission point emitting a light beam having a second wavelength different from N times (N is a natural number) said first wavelength in the direction substantially parallel to the first direction, said third semiconductor laser device comprising a third semiconductor layer having a third emission point emitting a light beam having a third wavelength substantially equal to N times (N is a natural number) said first wavelength in the direction substantially parallel to the first direction, said second semiconductor laser device and said third semiconductor laser device being stacked on said first semiconductor laser device such that said second semiconductor layer and said third semiconductor layer are opposed to said first semiconductor layer, and the distance between said first emission point and said third emission point being shorter than the distance between said first emission point and said second emission point on a first plane perpendicular to said first direction, wherein said first semiconductor laser device further comprises a first electrode formed on said first semiconductor layer, said second semiconductor laser device further comprises a second electrode formed on said second semiconductor layer, said third semiconductor laser device further comprises a third electrode formed on said third semiconductor layer, said first electrode, said second electrode, and said third electrode are insulated from one another, said second semiconductor laser device further comprises a second substrate, said second semiconductor layer being formed on said second substrate, said third semiconductor laser device further comprises a third substrate, said third semiconductor layer being formed on said third substrate, at least one of said second substrate and said third substrate being composed of a material different from said first substrate, said second and third substrates are a common substrate, said second semiconductor layer is formed in a first region of said common substrate, and said third semiconductor layer is formed in a second region of said common substrate, and a thickness from said common substrate to a surface of said second semiconductor layer is larger than a thickness from said common substrate to a surface of said third semiconductor layer in a direction substantially perpendicular to one surface of said first substrate.