Abstract

It is well known that in atomic media the time dependent density of a resonantly excited two-level system exhibits oscillations or Rabi-flops between dipole coupled states.^[1] We have predicted earlier^[2] that this coherent phenomenon also occurs in semiconductors under resonant femtosecond laser excitation. Here we report on experimental observations and theoretical confirmations of the off-resonant Rabi-flopping in a GaAs MQW waveguide. Femtosecond laser pulses with various intensities are launched into a waveguide structure and transmitted pulse shapes are measured using cross correlation techniques. The results are compared with a theory that involves solving the twoband semiconductor Bloch equations and the wave equation for the electromagnetic field self-consistently.

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