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

It is reported about the first observation (in a solidstate sample) and detailed investigation of the stimulated femtosecond 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 exciting 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. (© 2006 by Astro, Ltd. Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)