Patent ID: 7194014
Filing Date: 2007-03-20
Classification: B82Y,G02B,H01S

Abstract:
1. A semiconductor laser device comprising: a first stripe structure that has a first active layer grown on a first portion of a semiconductor substrate and a first diffraction grating formed in a vicinity of the first active layer, said first stripe structure configured to emit a first laser beam having a plurality of oscillation longitudinal modes with a first center wavelength selected by the first diffraction grating; and a second stripe structure that has a second active layer grown on a second portion of the semiconductor substrate and a second diffraction grating formed in a vicinity of the second active layer, said second stripe structure configured to emit a second laser beam having a plurality of oscillation longitudinal modes with a second center wavelength selected by the second diffraction grating, wherein the first center wavelength differs from the second center wavelength, and wherein an oscillation wavelength spectrum formed by the oscillation longitudinal modes belonging to the first laser beam and an oscillation wavelength spectrum formed by the oscillation longitudinal modes belonging to the second laser beam do not cross each other in a range in which the intensity difference with respect to a peak power is not more than 3 dB.