Patent ID: 6091753
Filing Date: 2000-07-18
Classification: B82Y,H01S

Abstract:
Article comprising a quantum cascade laser comprising, in sequence, an upper optical confinement region, a waveguide core region and a lower optical confinement region, and further comprising contacts for electrically contacting the laser; said waveguide core region comprising a multiplicity of essentially identical repeat units, a given repeat unit comprising an injector region and a superlattice active region selected to facilitate radiative carrier transition from an upper to a lower energy state of the superlattice active region; said injector region selected to facilitate, under appropriate electrical bias, charge carrier passage from the lower energy state of a given superlattice active region to the upper energy state of the immediately adjacent downstream superlattice active region;CHARACTERIZED IN THATa) said given superlattice active region is not intentionally doped;b) at least a portion of said given injector region is doped n-type, with a dopant concentration selected such that, under said electrical bias, the superlattice active region is substantially electric field free.