Patent ID: 7075960

Claim:
A semiconductor laser apparatus comprising: a semiconductor substrate whose main surface has a recess, a side wall of the recess having an optical reflector that receives a laser beam and reflects the received laser beam outward in a substrate-thickness direction; a semiconductor laser element that is deposited in the recess and emits the laser beam toward the optical reflector in a direction substantially parallel to the main surface of the semiconductor substrate; a heat sink layer that is formed in a bottom face of the recess so as to adjust a position of the semiconductor laser element in the substrate-thickness direction and to let heat, which is generated as the semiconductor laser element operates, escape toward the semiconductor substrate; a bonding layer formed in contact with a surface, which faces the bottom face of the recess, of the semiconductor laser element; and a diffusion preventing layer that is embedded between the heat sink layer and the bonding layer, possesses electrical conductivity, and prevents a diffusion from occurring between the heat sink layer and the bonding layer.