Patent ID: 6240114
Filing Date: 2001-05-29
Classification: B82Y,H01S

Abstract:
A SCH MQW laser comprisinga semiconductor active region comprising a multiplicity of stacked repeat units, each unit including an InGaAsP quantum well layer and a wider bandgap InGaAsP barrier region adjacent one another, each of said quantum well layers being capable of generating stimulated emission of radiation when suitable pumping energy is applied thereto,an optical cavity resonator within which said active region is disposed,each of said barrier regions including a multiplicity of barrier layers, a multiplicity of said barrier regions each including a pair of undoped barrier layers and a p-type barrier layer positioned therebetween, said p-type barrier layer being a delta-doped layer with a dopant selected from the group consisting of Be, Mg and C to a hole sheet density of about 2.times.10.sup.11 cm.sup.-2 -1.times.10.sup.12 cm.sup.-2, the thickness of each of said undoped barrier layers being not less than a diffusion length of said selected dopant, and the thickness of said doped barrier layer being approximately one-fifth of the total thickness of said barrier region, so that said laser has a characteristic temperature of at least 77 K approximately,a pair of inner cladding semiconductor regions bounding said active region, anda pair of outer cladding semiconductor regions bounding said inner cladding regions.