Patent ID: 7813397

Claim:
A nitride semiconductor laser device comprising: a nitride semiconductor substrate having a first principal face: a nitride semiconductor layer having a first conductivity type; an active layer; and a nitride semiconductor layer having a second conductivity type that is different from the first conductivity type and including a stripe ridge formed on the surface thereof, the nitride semiconductor layer having the first conductivity type, the active layer and the nitride semiconductor layer having the second conductivity type being formed on the first principal face of the nitride semiconductor substrate in this order, the first principal face of the nitride semiconductor substrate having an off angle a (θa) in a direction substantially parallel to the stripe ridge, and an off angle b (θb) in a direction substantially perpendicular thereto, with respect to a reference crystal plane, |θa|>|θb| is satisfied, and a second principal face of the nitride semiconductor substrate having an off angle of 0.2 to 90°.