Patent ID: 8030110

Claim:
A method for fabricating a nitride semiconductor laser device, comprising: a first step of forming a substrate whose top surface is a nitride semiconductor layer and that has a carved region and a non-carved region; a second step of forming, directly onto the top surface of the substrate, a nitride semiconductor film having a stripe-shaped laser light waveguide structure, wherein the top surface of the substrate has a low defect region with a defect density of 10 6 cm −2 or less, in the first step, the carved region is formed in the top surface of the substrate in the low defect region of the substrate, and the non-carved region is formed in the top surface of the substrate, in the second step, the nitride semiconductor film is formed above both the carved region and the non-carved region, in the second step, the laser light waveguide structure in the nitride semiconductor film is formed right above the non-carved region, and in the second step, the laser light waveguide structure in the nitride semiconductor film is formed in a region located 5 μm or more away from the nearest edge of the carved region in the top surface of the substrate.