Quantum Optics Seminar by Ravitej Uppu – Københavns Universitet

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Quantum Optics Seminar by Ravitej Uppu

Disordered amplifying media exhibit many interesting features in their emission through a synergy between multiple scattering and amplification. These features include the existence of strong ultranarrow peaks in the emission and a laser-like threshold in the emission intensity (hence the term "random lasers"). The inherent randomness leads to statistical fluctuations in frequency and intensity. We study these fluctuations in the
emission to characterize the emission into distinct statistical regimes - pre-lasing Gaussian, lasing Levy and self-averaged Gaussian. We consolidate these experimental studies through numero-analytical techniques based on solutions of the diffusion equation and photon transport Monte-Carlo methods. We also exploit the statistical amplification in random lasers to gain control on the emission frequency.