Linear electron-phonon interaction in dye-doped polymers

Abstract The temperature-dependent variation of phonon sideband spectrum in dye-doped polymers has been investigated with Fourier transform femtosecond photon-echo spectroscopy. From the analysis taking into account the linear electron-phonon interaction, it is found that the ultrafast decay of the echo signals observed at higher temperatures is due to excitation from the thermally occupied phonon state in the ground state.