Patent ID: 7082152
Filing Date: 2006-07-25
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser apparatus comprising: a first reflecting film provided on an emission end face of a laser beam; an active layer formed between the first reflecting film and a second reflecting film provided on a reflection end face of the laser beam; and a diffraction grating configured to emit the laser beam having a plurality of oscillation longitudinal modes, said diffraction grating selecting light, wherein the number of oscillation longitudinal modes is determined based on the total intensity of the laser beam and an effective cross section of an optical fiber when the laser beam is transmitted using the optical fiber when the differential values between the intensity of the oscillation longitudinal modes and the intensity of longitudinal mode having the highest optical intensity are not more than 10 dB, wherein the diffraction grating has a diffraction grating length of not more than 300 um.