Abstract
The dynamics of free carriers in bulk GaAs was controlled by changing the chirp of the excitation light pulses having a duration in the 10 fs regime. Pump-probe measurements showed that the transmittance increases for negatively chirped pump pulses, which is in contrast to the trend observed with other materials. The result is explained by a combination of a pump-dump process and bandgap renormalization, and shows the possibility of new way to control nonlinear optical response of semiconductors.
© 2004 Optical Society of America
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