Abstract
The signals of both primary and stimulated femtosecond photon echoes are observed and investigated in a dye-doped polymer film at room temperature using a modernized femtosecond echo-spectrometer. It should be noted that stimulated photon echo in the solid-state sample is observed for the first time at such a high temperature. Experimentally obtained decay curves of these signals have a nonexponential character. The spectra of these echo signals are also measured. It is found that the spectrum of the primary photon echo is short-wave shifted with respect to the spectrum of excitation. This can be used for the coherent laser cooling of a sample. The spectrum of the stimulated photon echo is also shifted to the short-wave range relative to the spectrum of excitation, but its shift is much less than that of the primary photon echo. The experiment shows that the femtosecond echo signals at room temperature are excited via the phonon-side band of the absorption line.
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Lobkov, V.S., Leontiev, A.V., Salikhov, K.M. et al. Femtosecond primary and stimulated photon echoes in a dye-doped polymer film at room temperature. Laser Phys. 17, 332–338 (2007). https://doi.org/10.1134/S1054660X0704007X
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DOI: https://doi.org/10.1134/S1054660X0704007X