Patent ID: 6567449
Filing Date: 2003-05-20
Classification: H01S

Abstract:
A semiconductor laser comprising:a semiconductor substrate; a first light emitting region of semiconductor layers provided on said semiconductor substrate, said semiconductor layers of first light emitting region having an active layer, determined by a first wavelength of laser beam, sandwiched between two cladding layers of which the band gap is greater than that of said active layer; and a second light emitting region of semiconductor layers provided on said first light emitting region, said semiconductor layers of said second light emitting region having an active layer, determined by a second wavelength of laser beam, sandwiched between two cladding layers of which the band gap is greater than that of said active layer, wherein said first light emitting region and said second light emitting region are aligned with each other along the perpendicular to said semiconductor substrate, wherein both of said first and second light emitting regions are formed of ridge structures, and wherein said first and second light emitting regions are joined through a contact layer and an upper electrode of said first light emitting region and a lower electrode of said second light emitting region are provided in common on an electrode forming layer which is electrically connected to said contact layer.