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Laser Physics Letters

Optical two-colour superfluorescence in biphenyl crystal with pyrene: the influence of crystal symmetry

P. V. Zinoviev, А. А. Калачев, Alexander A. Kalinkin, В. В. Самарцев, Nataliya B. Silaeva

Published Feb 7, 2004• 1 citation
Publisher

Abstract

The influence of crystal symmetry on the polarization properties of two-colour optical superfluorescence in biphenyl crystal with pyrene is investigated both theoretically and experimentally. It is shown that polarization of superfluorescence signal is determined by the asymmetry between absorbtion and emission spectra of pyrene molecules in biphenyl, which results in polarization decoupling of pumping and superfluorescence pulses.

DOI
10.1002/lapl.200310037

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The influence of crystal symmetry on the polarization properties of two-colour optical superfluorescence in biphenyl crystal with pyrene is investigated both theoretically and experimentally. It is shown that polarization of superfluorescence signal is determined by the asymmetry between absorbtion and emission spectra of pyrene molecules in biphenyl, which results in polarization decoupling of pumping and superfluorescence pulses.
The results of theoretical and experimental superradiance studies in a pyrene-doped biphenyl crystal are presented. The superradiance nature of photon emission under certain conditions is experimentally proved for this crystal system. Experimental data fit the theory. The influence of induced radiation and of electron-phonon coupling on optical superradiance is theoretically investigated using the nonequilibrium statistical operator method. Possible superradiance applications are discussed, including coherent nonlinear spectroscopy, coherent electromagnetic pulse generation, and superradiant echo.
The effect of coherence and the exciting radiation linewidth on the formation of superradiance has been investigated, using a pyrene-doped molecular biphenyl crystal as an example. Three types of lasers with various degrees of coherence and substantially different emission linewidths provided the excitation. The formation of superradiance is shown to be independent of the degree of pumping coherence and its spectral composition is shown to depend on the exciting radiation bandwidth. The investigations demonstrate that optical superradiance holds out promise in high-resolution spectroscopy.
Abstract For the first time peculiarities of the formation of Dicke optical superradiance are studied experimentally and theoretically in a pyrene‐doped biphenyl crystal under active phonon effect (the energy level is 1Ag−1B2u; wavelength 373.93 nm; pyrene concentration 0.25 mol%; temperature 1.5 to 4.2 K). The possibilities of this phenomenon to obtain spectroscopic data are demonstrated. The pseudolocalized phonon lifetime τphon and the activation energy ΔE are estimated to ΔE = (7 ± 3) cm−1 and τphon = 2 to 20 ps by the temperature dependence of the superradiance intensity.