Patent ID: 7294863
Filing Date: 2007-11-13
Classification: H01S

Abstract:
1. A micro-lens built-in vertical cavity surface emitting laser (VCSEL) comprising: a substrate; a lower reflector formed on the substrate; an active layer formed on the lower reflector, generating light by a recombination of electrons and holes; an upper reflector formed on the active layer comprising a lower reflectivity than that of the lower reflector; a micro-lens disposed in a window region and comprising a single convex surface having an arch extending through the entire window region through which the laser beam is emitted to collimate the laser beam across the entire window region; a lens layer formed on the upper reflector with a transparent material transmitting a laser beam, the lens layer comprising the micro-lens; an upper electrode formed above the upper reflector excluding the window region; and a lower electrode formed underneath the substrate, wherein the VCSEL satisfies the relationship: where f is a distance along an optical axis from a light generating region of the active layer to a vertex of the micro-lens, R is a radius of curvature of the micro-lens, n