Identification of statistical regimes and crossovers in coherent random laser emission |
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Authors: | Uppu Ravitej Tiwari Anjani Kumar Mujumdar Sushil |
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Institution: | Nano-optics and Mesoscopic Optics Laboratory, Tata Institute of Fundamental Research, Mumbai, India. |
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Abstract: | We measure intensity statistics and identify statistical regimes and crossovers in random lasers based on nonresonant feedback. A single parameter extracted from an α-stable Levy fit is used to characterize the intensity distributions in all regimes. Measurements made over a range of scattering strengths, excitation energies, and sample sizes enable us to demarcate three regimes of intensity statistics and the corresponding crossovers. An initial subthreshold Gaussian regime abruptly transits into a Levy regime at the random lasing threshold, which is followed by a continuous gradual crossover toward a second Gaussian regime. We find that the prominence of the Levy regime depends upon the sample size. |
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