BROAD-BAND FEMTOSECOND PUMP-PROBE SETUP OPERATING AT 1300 AND 1550 NM

We describe a broadband, tunable femtosecond 'pump-probe measurement s etup operating in the 1300 and 1550 nm wavelength range. We demonstrat e measurements of carrier dynamics in the barrier states of a multiple quantum well optical amplifier. The amplifier is excited (pumped) in the gain region near 1510 nm and probed, with femtosecond time resolut ion, in the barrier region, at 1300 nm, yielding dynamical details whi ch cannot be observed with conventional, single-wavelength pump-probe techniques.