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Periodic structures are observed both in the spectra of real and imaginary parts of the nonlinear susceptibility of an optically transparent medium. The oscillation period is approximately proportional to the delay time between pump and probe pulses. The periodic structures are attributed to an induced grating caused by an inertial response of a molecular motion.
Simultaneous measurement of continuous spectra of real and imaginary parts of complex nonlinear optical susceptibility was performed for porphyrin J-aggregates with sharp absorption peaks using a femtosecond Sagnac interferometer. A nonresonant component (χ (3)NR ) due to a solvent and a resonant component (χ (3)R ) due to the porphyrin J-aggregates...
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