Anistropy and broadening of optical gain in a GaAs/AlGaAs multiquantum-well laser

Comparison of band-filling and gain models for multiple-quantum-well lasers

“…The bands can be assumed to be parabolic with their shape determined by the effective masses calculated from the material composition. 1 This implies a significant simplification in numerical calculations. Another common approach is to include band-mixing effects in the valence band.…”

Gain calculation of InGaAsP/InP multi-quantum well lasers

“…We define an energy component of a dipole moment vibrating along the y direction with E,,,, which consists of an electron and hole pair [7] Adding energy components Exe along the x and z directions and the band gap energy Eg, the total energy of dipole is [7j…”

“…Applying the so-called k.p perturbation approach developed by Kane 171, the dipole moment in quantum well structure is written as [4]- [7].…”

“…where, 8 is angle between the k-vector and the y-axis given with the energy components a5 RO the value of the dipole moment in the bulk material which is given by [4]- [7] where A is the split-off energy in the valence band, m, is mass of the conduction electron and free electron the mass of a where and E , are the total energies of electrons and holes for subbands n, k the Boltzman constant, and T the absolute temperature.…”

“…The energy levels, EI,, in a single well were calculated w i t h Shrodinger's equation assuming that couplings of electron waves among different wells are v e q weak. The band-edge discontinuities at the wells are assumed to be AEc: AEv = 0.65:0.35 fory=l.Using the parabolic band model [4]-[7] E], is given by…”