Publication # 169

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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