Patent ID: 8541253

Claim:
A method of fabricating a III-nitride semiconductor laser device, comprising the steps of: preparing a substrate with a semipolar primary surface, the semipolar primary surface comprising a hexagonal III-nitride semiconductor; forming a substrate product having a laser structure, an anode electrode, and a cathode electrode, the laser structure comprising a substrate and a semiconductor region, and the semiconductor region being formed on the semipolar primary surface; after forming the substrate product, forming first and second end faces; and forming first and second dielectric multilayer films for an optical cavity of the nitride semiconductor laser device on the first and second end faces, respectively, the first and second end faces intersecting with a reference plane, the reference plane being defined by a normal axis to the semipolar primary surface and any one crystal axis of a- and m-axes of the hexagonal III-nitride semiconductor, the semiconductor region comprising a first cladding layer of a first conductivity type gallium nitride-based semiconductor, a second cladding layer of a second conductivity type gallium nitride-based semiconductor, and an active layer, and the active layer being 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 in a direction of the normal axis, the active layer comprising a gallium nitride-based semiconductor layer, the semipolar primary surface of the substrate being inclined at an angle in a range of not less than 45 degrees and not more than 80 degrees and of not less than 100 degrees and not more than 135 degrees with respect to a plane perpendicular to a c+ axis vector, and the c+ axis vector indicating a direction of the <0001> axis of the nitride semiconductor, the c+ axis vector making an acute angle with a waveguide vector, and the waveguide vector indicating a direction from the second end face to the first end face, and a thickness of the second dielectric multilayer film being smaller than a thickness of the first dielectric multilayer film.