Patent ID: 7903708

Claim:
A nitride semiconductor laser device comprising: a substrate whose top surface is a nitride semiconductor layer; and a nitride semiconductor film laid directly onto the top surface of the substrate and 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, a carved region is formed in the top surface of the substrate in the low defect region of the substrate, a non-carved region is formed in the top surface of the substrate, the nitride semiconductor film lies above both the carved region and the non-carved region, the laser light waveguide structure in the nitride semiconductor film is formed right above the non-carved region, and 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.