Broadband femtosecond pump-probe setup operating at 1300 and 1550 nm

We describe a broadband, tunable femtosecond pump-probe measurement setup operating in the 1300 and 1550 nm wavelength range. We demonstrate 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 resolution, in the barrier region, at 1300 nm, yielding dynamical details which cannot be observed with conventional, single- wavelength pump-probe techniques.