Abstract
Electro-optic sampling and tunable infrared femtosecond optical pulses are used to measure photocurrent transients generated in GaAs quantum well coplanar microstrip samples at 77 K. This combination allows us to investigate the dynamics of photocurrent with 300 fs time resolution while exciting near the exciton resonance. We find no evidence for ac–dc Stark effect (below-bandgap field-induced optical rectification) signals at small detunings with the electric field applied either parallel or perpendicular to the quantum wells; however, other photoconductive overshoot transients are observed.
© 1992 Optical Society of America
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