||D. S. Kim, J. Shah, D. A. B. Miller, and T.
C. Damen, Wilfred Schäfer, L. Pfeiffer "Femtosecond-pulse distortion in quantum
wells" Phys. Rev. B, 48, 902-905 (1993).
We show that a
low-intensity femtosecond pulse is severely distorted while propagating through a
relatively thin (<7000 Angstrom) GaAs multiple-quantum-well sample and that this pulse
distortion depends critically on the dephasing time T2 and the total thickness l.
An interferometric measurement reveals the existence of well-defined nodes at which the
envelope function changes its sign. This pulse distortion significantly affects
femtosecond experiments such as pump-probe or four-wave-mixing experiments.
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