Patent ID: 6456638
Filing Date: 2002-09-24
Classification: H01S

Abstract:
A semiconductor laser device comprising:a pair of electrodes; a conductive substrate connected to one of the pair of electrodes; a lower cladding layer formed on the conductive substrate; a lower optical waveguide layer formed on the lower cladding layer; a single or multiple quantum well active layer formed on the lower optical waveguide layer; an upper optical waveguide layer formed on the quantum well active layer; an upper cladding layer formed on the upper optical waveguide layer; and a contact layer formed on the upper cladding layer; the other of the pair of electrodes formed on the contact layer; wherein the conductive substrate is made of InGa material, and the lower cladding layer is made of one of InGaN and InGaAlN material and has a composition which causes a strain not less than âˆ’0.01 and not greater than 0.01 between the lower cladding layer and the conductive substrate.