Abstract
We present measurements and calculations of femtosecond gain dynamics in As/As strained-layer single-quantum-well diode lasers using a multiple-wavelength pump-probe technique. To aid in the interpretation of gain dynamics induced by both interband absorption and stimulated emission of photons, we develop a detailed theoretical model for gain dynamics in quantum-well laser diode structures and compare it with experimental measurements. In the model, transient gain and differential transmission are computed in a multiband effective-mass model including biaxial strain, valence subband mixing, and polar-optical-phonon scattering both within and between subbands. Transient photogeneration of electron-hole pairs by the pump pulse and subsequent relaxation of carriers by polar-optical-phonon scattering are calculated in a Boltzmann-equation framework.
- Received 2 February 1994
DOI:https://doi.org/10.1103/PhysRevB.50.8539
©1994 American Physical Society