Patent ID: 8102888
Filing Date: 2012-01-24
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor laser for generating light; a diffraction grating optically coupled with the semiconductor laser for reflecting a part of light having a predetermined wavelength of the light from the semiconductor laser to the semiconductor laser; an optical waveguide for optically coupling between the semiconductor laser and the diffraction grating; and a temperature control device applying a periodical fluctuation to the temperature of the semiconductor laser, the diffraction grating, or the optical waveguide, wherein the periodical fluctuation to the temperature makes the semiconductor laser device carry out a multimode oscillation and remove the kink of IL characteristics of which a longitudinal mode shifts from a single mode to a multimode, in order that the semiconductor laser carries out a multimode oscillation from a low output to a high output without shifting between a single mode oscillation and a multimode oscillation.