Gain optimization in optically pumped AlGaAs unipolar quantum-well lasers

Gain Optimization in Optically Pumped AlGaAs Unipolar Quantum-Well Lasers

A method is described for the optimized design of quantum-well (QW) structures, in respect to maximizing the stimulated gain in optically pumped intersubband lasers. It relies on applying supersymmetric quantum mechanics (SUSYQM) to an initial Hamiltonian, in order to both map one bound state below the spectral range of the initial Hamiltonian, and to generate a parameter-controlled family of i...

Population inversion in optically pumped asymmetric quantum well terahertz lasers

Theory of Gain, Modulation Response, and Spectral Linewidth in AlGaAs Quantum Well Lasers

We investigate theoretically a number of important issues rent have been considered before [ 151, [ 161, although the related to the performance of AlGaAs quantum well (QW) semicongain saturation effect was not explicitly treated, In Section ductor lasers. These include a basic derivation of the laser gain, the linewidth enhancement factor a, and the differential gain constant in I11 the fundam...

Optically pumped laser characteristics of blue Znx8Cdy8Mg1Àx8Ày8SeÕZnxCdyMg1ÀxÀySe single quantum well lasers grown on InP

We report the operation of a photopumped blue Znx8Cdy8Mg12x82y8Se/ZnxCdyMg12x2ySe separate confinement heterostructure single quantum well laser grown lattice matched to InP with a relatively thick quaternary quantum well ~;50 Å!. Laser emission at 492 nm in the blue was observed. The lasing linewidth is about 5 nm. Based on the temperature dependency of the threshold pumping intensity, the cha...

Room-temperature optically-pumped InGaSb quantum well lasers monolithically grown on Si(100) substrate

Room-temperature optically-pumped In0.2Ga0.8Sb quantum well lasers on Si are reported. The defect-free monolithic epistructure growth on a Si(100) substrate is initiated by an AlSb quantum dot nucleation layer followed by an AlSb=GaSb superlattice. The 13% mismatch between the AlSb and Si lattice is accommodated by misfit dislocations and associated crystallographic undulations in the AlSb buff...