Patent ID: 7664151

Claim:
A nitride semiconductor laser device comprising: a substrate made of silicon in which a plane orientation of a principal surface is a {100} plane; a semiconductor laminate that includes a plurality of semiconductor layers including an active layer formed on the principal plane of the substrate, each of the plurality of semiconductor layers being made of group III-V nitride; a thin film formed between the substrate and the semiconductor laminate and made of silicon in which a plane orientation of a principal surface is a {111} plane, wherein: the semiconductor laminate has a cleaved facet which forms a facet mirror of the nitride semiconductor diode, the cleaved facet is parallel to a {001} plane which is a plane orientation of the silicon substrate, a plane orientation of a principal surface of the semiconductor laminate is a {0001} plane in gallium nitride, and the semiconductor laminate is epitaxially grown on a principal surface of the thin film.