Patent ID: 7362785

Claim:
A method for producing a semiconductor laser apparatus, the method comprising: a recess forming step for forming a recess in a semiconductor substrate by an anisotropic etching so that a side wall of the recess has a slant of substantially 45 degrees with respect to a main surface of the semiconductor substrate; a SiN layer forming step for, after the recess forming step, forming a SiN layer having a desired thickness on a bottom face of the recess by a plasma CVD method; a layer stacking step for, after the SiN layer forming step, forming a layer composed of Ti or TiW on an entire surface of the recess including the SiN layer and then forming a layer composed of Au or Pt on the layer composed of Ti or TiW, both by a sputtering method; a heat sink layer forming step for, after the layer stacking step, forming a heat sink layer composed of Au on the layer composed of Au or Pt, by plating; a covering step for, after the heat sink layer forming step, covering the heat sink layer with a layer that is composed of Ti or TiW and is thinner than the heat sink layer, and then covering the layer composed of Ti or TiW with a layer composed of Au or Pt, both by a sputtering method; and a bonding step for, after the covering step, bonding a semiconductor laser element with the layer composed of Au or Pt covering the heat sink layer, by soldering, wherein in the covering step, the layer composed of Au or Pt is formed to be thinner than the heat sink layer.