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Ученые записки Казанского университета. Серия Физико-математические науки

Оптическое охлаждение полимерных пленок при испускании сигналов фотонного эха

S. V. Petrushkin, Самарцев Виталий Владимирович

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

Some spectral features of the femtosecond self-diffraction, primary and stimulated photon echo signals on the S1 → S0 (at the wavelength 795 nm) of the phthalocyanine molecules HW 1009 type in the polyvinylbutyral film at room temperatures were observed. It is shown that under resonant pulsed excitation of various sections of the optical absorption band the spectral shifts for responses could be Stokes and anti-Stokes as well: at pump wavelength λ = 765 nm there is Stokes shift and at λ = 790 nm there is anti-Stokes shift. A simple femtosecond coherent laser cooling regime for dye-doped polymer film is proposed.

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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.

Laser Physics•Apr 1, 2007•10 citations
Some spectral features of the femtosecond self-diffraction, primary and stimulated photon echo signals on the S1 → S0 (at the wavelength 795 nm) of the phthalocyanine molecules HW 1009 type in the polyvinylbutyral film at room temperatures were observed. It is shown that under resonant pulsed excitation of various sections of the optical absorption band the spectral shifts for responses could be Stokes and anti-Stokes as well: at pump wavelength λ = 765 nm there is Stokes shift and at λ = 790 nm there is anti-Stokes shift. A simple femtosecond coherent laser cooling regime for dye-doped polymer film is proposed.
The signals of primary and stimulated femtosecond photon echoes are investigated in a dye-doped polymer film at room temperature. The homogeneous S 0 → S 1 spectral line width, which is due to the interaction between the impurity molecules and the quasi-local low-frequency modes, is estimated (≈5 × 1012 Hz). Special attention is paid to the study of spectra of femtosecond echo signals. The short-wave shifts of these spectra, with respect to the spectrum of femtosecond exciting pulses, are observed. These shifts indicate that the anti-Stokes regime of femtosecond pulse emission is realized. Therefore, the coherent regime of laser cooling of solids appears to be possible. The prospects of using of this new cooling regime in the function of a solid-state optical refrigerator are discussed.
It is reported about the first observation (in a solid-state 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.
The signals of primary and stimulated femtosecond photon echo in polymer films doped with dye (phthalocyanine) molecules have been experimentally investigated at room temperature. A femtosecond echo spectrometer for these echo experiments is described. The decay curves of echo signals with increasing time intervals between excitation femtosecond pulses are obtained and blue shifts of the spectra of femtosecond echo signals with respect to the spectrum of excitation pulses are revealed. The possibilities of using the studied doped polymer films as recording media for high-temperature echo processors and coolants in optical refrigerators are analyzed.
The first observation is reported of the primary and stimulated femtosecond photon echoes at liquid nitrogen and room temperatures in a dye-doped polymer film at a wavelength of 780 nm. Echo signals were generated by pulses with the duration of 65 fs. The primary echo signal decay at liquid nitrogen and room temperatures can not be described by a simple exponential function. The decay of primary echo signal at room temperature demonstrates complex behavior caused by the presence of the phonon-side band in the optical band of impurity centers. There were also detected signals of the self-diffraction of exciting pulses on a nonequilibrium population difference grating, induced in resonant medium by these pulses.
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.