Patent ID: 8772064
Filing Date: 2014-07-08
Classification: B82Y,H01S

Abstract:
1. A method of fabricating a III-nitride semiconductor laser device, the method comprising the steps of: preparing a substrate comprised of a hexagonal III-nitride semiconductor and having a semipolar primary surface; forming a substrate product having a laser structure, an anode electrode and a cathode electrode, the laser structure including a substrate and a semiconductor region formed on the semipolar primary surface; scribing a first surface of the substrate product in part in a direction of the a-axis of the hexagonal III-nitride semiconductor; and carrying out breakup of the substrate product by press against a second surface of the substrate product, to form another substrate product and a laser bar, the first surface being opposite to the second surface, the semiconductor region being located between the second surface and the substrate, the laser bar having first and second end faces, the first and second end faces extending from the first surface to the second surface, and the first and second end faces being made by the breakup, the first and second end faces forming a laser cavity of the III-nitride semiconductor laser device, the anode electrode and the cathode electrode being formed on the laser structure, the semiconductor region comprising a first cladding layer comprised of a first conductivity type GaN-based semiconductor, a second cladding layer comprised of a second conductivity type GaN-based semiconductor, and an active layer provided between the first cladding layer and the second cladding layer, the first cladding layer, the second cladding layer, and the active layer being arranged along an axis normal to the semipolar primary surface, the active layer comprising a GaN-based semiconductor layer, a c-axis of the hexagonal III-nitride semiconductor of the substrate being inclined at a finite angle ALPHA with respect to the normal axis toward an m-axis of the hexagonal III-nitride semiconductor, the angle ALPHA being in one of a range of not less than 45 degrees and not more than 80 degrees and a range of not less than 100 degrees and not more than 135 degrees, and the first and second end faces intersecting with an m-n plane defined by the normal axis and the m-axis of the hexagonal III-nitride semiconductor.