Patent ID: 6873634

Claim:
A semiconductor laser diode, comprising: a contact layer made of GaN; a first conductive type nitride semiconductor layer formed on said contact layer and made of Al x Ga 1-x N(0.04≦x≦0.08); a first conductive type clad layer formed on said first conductive type nitride semiconductor layer and made of nitride semiconductor; a core area formed on said first conductive type clad layer and made of nitride semiconductor, said core area including an active layer to emit light by electric current injection; and a second conductive type clad layer formed on said core area and made of nitride semiconductor; wherein the thickness of said first conductive type nitride semiconductor layer is from 0.3 μm to 1.0 μm; and wherein said first conductive type clad layer contains Al y Ga 1-y N(0.05≦y≦0.20, x<y).