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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical superradiance in a crystal of biphenyl with pyrene

Sergei N. Andrianov, Самарцев Виталий Владимирович, Nataliya B. Silaeva, Pyotr V. Zinoviev

Published Jan 14, 2000• 1 citation
Publisher

Abstract

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.

DOI
10.1117/12.375336

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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.
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.
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.