Vertical-cavity surface-emitting laser

Abstract

To provide a vertical resonance type surface emission laser capable of radiating a light having smaller spectrum width.SOLUTION: A vertical resonance type surface emission laser comprises: a post that is provided onto a main surface of a substrate, and is extended along a first axis crossing the main surface of the substrate; and an electrode that is provided onto the upper surface of the post, and surrounds the first axis. The post comprises: a first distribution Bragg reflector; an activation layer; a current construction layer; and a second distribution Bragg reflector. The second distribution Bragg reflector contains: a semiconductor region; and a high resistance region surrounding the semiconductor region. The current constriction layer contains: an aperture part; and an oxidation part that surrounds the aperture part. In a cross section orthogonal to the first shaft, a length of the longest line of lines connecting optional two points on an inner edge of the oxidation part is D1, and the longest line of lines connecting the optional two points on the inner edge of the hight resistance region in the cross section orthogonal to the first axis is D2. A value of D2 / D1 exceeds 1 and is equal to or smaller than 2.5.SELECTED DRAWING: Figure 2

Images