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Radiation trapping in an alkali-vapor-noble-gas mixture excited by a strong laser pulse |
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| Authors: | N N Bezuglov A N Klucharev B Taratin T Stacewicz A F Molisch F Fuso and M Allegrini |
| Institution: | a Physics Institute, St. Petersburg University, Ulianovskaya 1, 198904, St. Petersburg, Russia b Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681, Warsaw, Poland c Institut für Nachrichtentechnik und Hochfrequenztechnik, Technische Universität Wien Gußhausstraße 25/389, A-1040, Wien, Austria d Dipartimento di Fisica, Università di Pisa, Piazza Torricelli 2, I-56126, Pisa, Italy e Dipartimento di Fisica della Materia, Geofisica e Fisica dell'Ambiente, Università di Messina, Salita Sperone 31, I-98166, Sant'Agata, Italy f Unità INFM, Dipartimento di Fisica, Università di Pisa, Piazza Torricelli 2, I-56126, Pisa, Italy |
| Abstract: | We analyze the nonlinear, non-stationary radiation trapping process in a cell filled with a noble gas and an alkali vapor excited by a short intense laser pulse. We derive analytical approximations for the total density of the excited atoms, and for the radiation emerging from the cell. The considered lineshapes are pure Doppler, Voigt, and pure Lorentzian profiles. We confirm that the emergent radiation can decay faster than with the natural lifetime of the atomic transition. We also show that as we increase the noble gas pressure, the decay of the emergent radiation becomes slower at early times and faster at late times. |
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