Stimulated femtosecond photon echo in a dye-doped polymer film at room temperature

It is reported about the first observation (in a solid- state sample) and detailed investigation of the stimulated fem- tosecond photon echo (SFPE) signals at room temperature in a polyvinylbutural film doped with molecules of phthalocyanine of HW 1009 type at the wavelength of 788 nm. A dependence of relative intensity of these echo-signals on time intervals between the second and the third exciting pulses was studied and the SFPE spectrum was investigated with respect to the spectra of both ex- citing pulses and signals of self-diffraction. It was found that the linear electron-phonon coupling is weak and the influence of the phonon-side band of the absorption line on the SFPE signals is less significantly than on the signals of primary photon echo. ln(ISFPE), a.u.