Patent ID: 7486712

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 layer comprises a first projection extending in the direction substantially parallel to said first direction, said third semiconductor layer comprises a third projection extending in the direction substantially parallel to said first direction, and the width of said third projection is larger than the width of said first projection in a second direction perpendicular to said first direction and parallel to one surface of the first substrate.