Scientific Results

Experimental and theoretical investigation of statistical regimes in random laser emission

Year: 2013

Authors: Ignesti E., Tommasi F., Fini L., Lepri S., Radhalakshmi V., Wiersma D., Cavalieri S.

Autors Affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, Italy; European Laboratory for Nonlinear Spectroscopy (LENS), Università di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy;
Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy;
INO-CNR, Largo Fermi 6, I-50125 Firenze, Italy

Abstract: We present a theoretical and experimental study aimed at characterizing statistical regimes in a random laser. Both the theoretical simulations and the experimental results show the possibility of three regions of fluctuations increasing the pumping energy. An initial Gaussian regime is followed by Levy statistics, and Gaussian statistics is recovered again for high pump pulse energy. These different statistical regimes are possible in a weakly diffusive active medium, while the region of Levy statistics disappears when the medium is strongly diffusive presenting always a Gaussian regime with smooth emission spectrum. Experiments and theory agree in identification of the key parameters determining the statistical regimes of the random laser.

Journal/Review: PHYSICAL REVIEW A

Volume: 88 (3)      Pages from: 033820  to: 033820

KeyWords: random-media; stable laws; light; parameters; diffusion
DOI: 10.1103/PhysRevA.88.033820

Citations: 27
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English