Abstract
The photon echo effect in dye molecules in solution has not been studied since effective mechanisms for inhomogeneous line broadening are not expected. We show that photon echoes may occur on a femtosecond time scale when the observation times are shorter than the memory time of the heat bath, and hence non-Markovian features of the molecular dephasing may become relevant. The properties and the dependence of the echo on the characteristics of the non-Markovian dephasing process are studied.
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