Patent ID: 8699539
Filing Date: 2014-04-15
Classification: B82Y,H01S

Abstract:
1. A surface emitting laser, comprising: an n-type cladding layer an active layer on said n-type cladding layer; an electron blocking layer on said active layer; and a photonic crystal layer on said electron blocking layer, wherein said photonic crystal layer has a high refractive index portion made of a first p-type semiconductor and a low refractive index portion in an in-plane direction of said active layer, wherein said electron blocking layer is made of a second p-type semiconductor, wherein a band gap of said first p-type semiconductor is smaller than a band gap of said second p-type semiconductor, wherein the band gap of said first p-type semiconductor decreases stepwise or continuously from an electron blocking layer side of said photonic crystal layer to an opposite side of said photonic crystal layer, and wherein a third p-type semiconductor having an acceptor doping concentration smaller than that of said second p-type semiconductor is disposed so as to cover a surface of said electron blocking layer corresponding to the low refractive index portion.