Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 117, Issue 18, Pages 8454-8466Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1512648
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Time-resolved optical pump-terahertz (THz) probe experiments are currently used to obtain information about the ultrafast dynamics of photoexcited carriers in semiconductors and about the far-infrared nonlinear response during solvation in liquids. The THz dynamics in such photoexcited systems is fully characterized by a two-dimensional nonlinear susceptibility. We have developed a frequency-domain analytical method for the direct extraction of this susceptibility from the experimental data. Following effects are taken into account: dispersive propagation of radiation in a photoexcited medium, refraction on its surfaces, THz sensor responsivity, and spatio-temporal transformations of the THz pulses. Strategies for possible experiments are discussed. (C) 2002 American Institute of Physics.
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