Patent ID: 6950451

Claim:
A multi-beam semiconductor laser device comprising: a common substrate within which are formed high density defective regions originating from seed crystal areas and meeting locations and low density defective regions each of which is located between adjacent ones of the seed crystal areas and the meeting locations, the high density defective regions and the low density defective regions being periodically and alternately arranged in parallel with each other in the form of stripes; and a plurality of laser oscillating regions formed on the common substrate and capable of emitting laser beams respectively, wherein, each of the laser oscillating regions is located in a different one of the low density defective regions, X 1 ≧0.5 μm, and X 2 ≧0.5 μm, where X 1 is a distance between the each of the laser oscillating regions and one of the seed crystal areas, and X 2 is a distance between the each of the laser oscillating regions and one of the meeting locations.