Patent ID: 7796668
Filing Date: 2010-09-14
Classification: H01S

Abstract:
1. A vertical cavity surface emitting laser comprising: first and second mirrors as reflecting mirrors included in a resonator; an active layer positioned between the first mirror and the second mirror; and a current-confining layer for confining an electric current injected into the active layer, wherein the first mirror includes a periodic refractive index structure in a plane direction of the mirror, and a phase-shift part, whereby a light beam introduced perpendicularly to a mirror plane resonating in the plane direction of the mirror and is reflected in a direction perpendicular to the plane direction of the mirror, a reflectivity of a specific resonant mode in a neighboring region to the phase-shift part is lower than a reflectivity in regions other than the neighboring region, the periodic refractive index structure has a one-dimensional periodic structure in which a refractive index changes periodically in one direction in the mirror plane, the one-dimensional periodic structure is a one-dimensional photonic crystal, and therein two or more phase-shift portions are provided at positions where light in the plane direction of the mirror that passes through each phase-shift portion does not interfere, the current-confining layer is an oxidation aperture with a diameter in a range of from 5 to 8 μm, and the phase-shift part is positioned outside the oxidation aperture.