Patent ID: 6208681
Filing Date: 2001-03-27
Classification: H01S

Abstract:
A surface emitting laser having a light emitting surface, said laser comprising:a substrate;a plurality of semiconductor layers formed on said substrate;one of said semiconductor layers comprising an active layer having an active region therein;a first reflector located on one side of said active layer and a second reflector located on the opposite side of said active layer, at least one of said reflectors allowing a partial transmission of light energy therethrough;one of said semiconductor layers being a current controlling layer, said current controlling layer being penetrated by four hollow cavities having a substantially square opening;an aperture region in said current controlling layer which controls current flowing through said active region, said aperture region being defined by a conductive region in said current controlling layer bordered by non-conductive regions in said current controlling layer, and wherein one of said non-conductive regions surrounds one of said four hollow cavities; andfirst and second electrodes located on said laser device to enable biasing of said active region.