Sj. Seki et al., THEORETICAL-ANALYSIS OF GAIN SATURATION COEFFICIENTS IN INP-BASED STRAINED-LAYER QUANTUM-WELL LASERS, Journal of applied physics, 74(4), 1993, pp. 2971-2973
The gain saturation coefficients of tensile-strained, lattice-matched,
and compressive-strained InGaAs/InGaAsP quantum-well lasers (QWLs) ar
e calculated from intrasubband relaxation times. The intrasubband rela
xation times are in turn obtained within the random-phase approximatio
n including carrier-carrier and carrier-polar-optical phonon interacti
ons at room temperature. The effects of strain on the band structures
are included by taking into account the strain-dependent coupling amon
g heavy-hole, light-hole, and spin-orbit split-off subbands on the bas
is of the multiband effective-mass theory. It is demonstrated that the
gain saturation coefficient in tensile-strained QWLs is less sensitiv
e to the amount of strain than in compressive-strained QWLs where it m
arkedly increases with strain.