Patent ID: 8249123
Filing Date: 2012-08-21
Classification: B82Y,H01S

Abstract:
1. A surface emitting laser that oscillates at a wavelength λ, comprising: a multilayer mirror; a lower clad layer; an active layer; an upper clad layer having an effective refractive index n; and a photonic crystal layer whose refractive index changes periodically within a plane parallel to a substrate, wherein the multilayer mirror, the lower clad layer, the active layer, the upper clad layer, and the photonic crystal layer are laminated in this order in a direction perpendicular to the substrate, wherein the photonic crystal layer has a lattice spacing a of λ/(n·sin θ) so as to separate a light having a wavelength λ perpendicularly incident on the photonic crystal layer into at least a transmitted light that forms an angle of 0° with respect to the direction of incidence of the light and a diffracted light incident on the multilayer mirror at an angle θ other than 0° and 90° with respect to the direction of incidence of the light, wherein each layer of the multilayer mirror has a thickness of λ/(4·n wherein a waveguide including the photonic crystal layer and the multilayer mirror has a resonant mode, and wherein the photonic crystal layer diffracts a light of the resonant mode in a direction perpendicular to the substrate.