Patent ID: 6429462
Filing Date: 2002-08-06
Classification: H01L

Abstract:
An injection incoherent emitter comprising:a heterostructure comprising: at least one active layer; cladding layers; and ohmic contacts, and at least one emission output area on at least one side of the active layer, the emission output area adjoining at least one of the cladding layers, the emission output area being transparent for emission, the emission output area comprising at least one emission output area layer having a refractive index noaq, where q=1, 2, . . . p is defined as a whole number that designates the ordinal number of the emission output area layer enumerated from a boundary of the emission output area with the heterostructure, the emission output area and the heterostructure together having an effective refractive index nef, the effective refractive index nef of the heterostructure and the emission output area and the refractive index noa1 of the emission output area being selected to satisfy the correlations: arc cos(nef/noa1)&gE;arc cos(nef min/noa1) and nef min is greater than nmin, where nef min is the minimum value of nef for heterostructures and adjoining emission output areas that produce spontaneous emission, and where nmin is the least of the refractive indices in the heterostructure cladding layer.