Patent ID: 8457167
Filing Date: 2013-06-04
Classification: H01L,H01S

Abstract:
1. A semiconductor laser device comprising: a GaN substrate; a semiconductor layer formed on a top surface of the GaN substrate; a ridge formed at a top of the semiconductor layer; a recess formed in a bottom surface of the GaN substrate, the recess having a depth less than a thickness of the GaN substrate, and the recess being formed directly under the ridge; a notch formed on a side surface of the GaN substrate intersecting with a direction of extension of the ridge and being separated from the recess by the GaN substrate, the notch being deeper than the recess; a first electrode formed on a top surface of the ridge; and a second electrode formed on a bottom surface of the recess, wherein a total thickness of the GaN substrate and the semiconductor layer is 100 μm or more, and a first distance is 5 μm or more and 50 μm or less, the first distance is a distance between the top surface of the ridge and the bottom surface of the recess, wherein the bottom surface of the recess has a width in a direction perpendicular to the direction of extension of the ridge equal to or larger than the first distance.