Patent ID: 7550757

Claim:
A semiconductor laser, comprising: a GaN substrate of Group III nitride-based compounds expressed by a compositional formula of GaN; a semiconductor laminated body on which a plurality of layers of Group III nitride based compounds expressed by a compositional formula of Al x Ga y In 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1) are laminated in a thickness direction of the GaN substrate; a positive electrode disposed at a top side of the semiconductor laminated body, the top side of the semiconductor laminated body being opposite to a bottom side of the semiconductor laminated body facing the GaN substrate; and a negative electrode including an Al layer in contact with a bottom side of the GaN substrate, the bottom side of the GaN substrate being opposite to a top side of the GaN substrate facing the semiconductor laminated body.