CARRIER RECOMBINATION DYNAMICS IN A (GAINSB INAS)/ALGASB SUPERLATTICEMULTIPLE-QUANTUM-WELL/

We have used the 830 nm, subpicosecond output of a mode-locked Ti:sapp hire laser, together with subpicosecond 3.55 mu m pulses from asynchro nously pumped optical parametric oscillator, to perform room-temperatu re, time-resolved, differential transmission measurements on a multipl e quantum well structure with AlGaSb barriers and GaInSb/InAs superlat tice wells. From these measurements, we have determined a Shockley-Rea d-Hall rate of 2.4X10(8) s(-1) and an Auger coefficient of 7x10(-27) c m(6)/s. In addition, we estimate the carrier capture efficiency into t he wells cm to be similar to 52% and have demonstrated that carrier co oling, cross-well transport, and capture are complete within similar t o 10 ps after excitation. (C) 1996 American Institute of Physics.