Patent ID: 6885687
Filing Date: 2005-04-26
Classification: H01S

Abstract:
1. A semiconductor laser module comprising: a semiconductor laser element which emits laser light; an optical wavelength selection element which selects a first portion of said laser light having a predetermined wavelength in order to feed back said first portion of said laser light to said semiconductor laser element; and an optical wavelength conversion element which includes an optical waveguide, receives a second portion of said laser light in said optical waveguide, and converts said second portion of said laser light to wavelength-converted laser light having a converted wavelength; said semiconductor laser element comprises a multiple-quantum-well active layer including a plurality of quantum-well sublayers each having a thickness and a composition, where one of the plurality of quantum-well sublayers is different from another of the plurality of quantum-well sublayers in at least one of the thickness and the composition, wherein an optical wavelength range of an overall gain spectrum of said multiple-quantum-well active layer comprises a gain spectrum of said one of the plurality of quantum-well sublayers and a gain spectrum of said another of the plurality of quantum-well sublayers, said gain spectrum of said one of the plurality of quantum-well sublayers being different from said gain spectrum of said another of the plurality of quantum-well sublayers, and both said gain spectrum of said one of the plurality of quantum-well sublayers and said gain spectrum of said another of the plurality of quantum-well sublayers contributing to the optical wavelength range of said overall gain spectrum.