Patent ID: 7924897

Claim:
A semiconductor laser device, comprising: a chip obtained from a substrate and a semiconductor multi-layer formed on the substrate, the semiconductor multi-layer being formed from a plurality of semiconductor layers of a semiconductor material having a hexagonal structure, and including a stripe-shaped wave guide portion, wherein the chip includes two chip end facets that extend in a direction crossing an extending direction of the wave guide portion, and two chip side facets that extend in parallel with the extending direction of the wave guide portion, a region including the wave guide portion in each chip end facet is a cleavage facet resulting from cleavage of the semiconductor multi-layer, each of regions on both sides of the wave guide portion in at least one of the chip end facets has a notch portion formed by notching a part of the chip, the notch portion exposing a first wall surface connecting to the chip end facet and a second wall surface connecting to the chip side facet, and an angle between an extending direction of the first wall surface in at least one of the two notch portions and an extending direction of the cleavage facet is in a range of about 10 degrees to about 40 degrees.