Abstract

Femtosecond spectroscopy aims at characterizing the dynamics of elementary excitations in material systems. One of the most common experimental techniques, spectrally resolved pump-probe spectroscopy, may in some cases present artifacts, the so-called coherent effects, which make data interpretation less straightforward than the incoherent picture would lead one to believe. It is therefore desirable to be able to rely on a theoretical model in order to assess the importance of coherent effects in these experiments. In this chapter, we will introduce such a formalism, which will also help in the discussion of other experimental techniques, such as photon echo, wave-packet excitation, and multidimensional spectroscopy.

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