Comparison of experimental and theoretical gain-current relations in GaInP quantum well lasers

Comparison of experimental and theoretical gain-current relations in GaInP 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...

Current injection efficiency of InGaAsN quantum-well lasers

The concept of below-threshold and above-threshold current injection efficiency of quantum well sQWd lasers is clarified. The analysis presented here is applied to the current injection efficiency of 1200 nm emitting InGaAs and 1300 nm emitting InGaAsN QW lasers. The role of heavy-hole leakage in the InGaAsN QW lasers is shown to be significant in determining the device temperature sensitivity....

Gain and Loss in Quantum Cascade Lasers

We report gain calculations for a quantum cascade laser using a fully self-consistent quantum mechanical approach based on the theory of nonequilibrium Green functions. Both the absolute value of the gain as well as the spectral position at threshold are in excellent agreement with experimental findings for T = 77K. The gain strongly decreases with temperature.

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...