Abstract
When a system is excited by an ultrashort pulse of light, a macroscopic polarization is created. After the excitation, the coherently prepared dipoles radiate in the forward direction while losing coherence because of dephasing by scattering, diffusion, etc., resulting in an exponential decay in time of the macroscopic polarization. Thus, the signal in the forward direction, the free polarization decay (FPD), has a decay time related to this polarization decay time (T2), and in the limit of delta-function pulses it has no rise time.
© 1995 Optical Society of America
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