We present a theoretical and experimental study aimed to characterize statistical regimes in a random laser. Both the theoretical simulations and the experimental results show the possibility of three region of fluctuations regime increasing the pumping energy. An initial Gaussian regime is followed by a Levy statistics and Gaussian statistic is recovered again for high pump pulse energy. These dierent statistical regimes are possible in a weakly diusive active medium while the region of Levy statistics disappears when the medium is strongly diusive presenting always a Gaussian regime with smooth emission spectrum. Experiments and theory agree in identication of the key parameters determining the statistical regimes of the random laser.
Experimental and theoretical investigation of statistical regimes in random laser emission / Emilio Ignesti; Federico Tommasi; Lorenzo Fini; Stefano Lepri; Vivekananthan Radhalakshmi; Diederik Wiersma ;Stefano Cavalieri. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 88:(2013), pp. 0833820-1-0833820-7. [10.1103/PhysRevA.88.033820]
Experimental and theoretical investigation of statistical regimes in random laser emission.
IGNESTI, EMILIO;TOMMASI, FEDERICO;FINI, LORENZO;LEPRI, STEFANO;WIERSMA, DIEDERIK SYBOLT;CAVALIERI, STEFANO
2013
Abstract
We present a theoretical and experimental study aimed to characterize statistical regimes in a random laser. Both the theoretical simulations and the experimental results show the possibility of three region of fluctuations regime increasing the pumping energy. An initial Gaussian regime is followed by a Levy statistics and Gaussian statistic is recovered again for high pump pulse energy. These dierent statistical regimes are possible in a weakly diusive active medium while the region of Levy statistics disappears when the medium is strongly diusive presenting always a Gaussian regime with smooth emission spectrum. Experiments and theory agree in identication of the key parameters determining the statistical regimes of the random laser.File | Dimensione | Formato | |
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