Dresden 2009 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonlinear stochastic systems
DY 30.1: Vortrag
Freitag, 27. März 2009, 10:15–10:30, ZEU 118
Strong interactions in diffusive random lasers — •Hakan E. Tureci1, Douglas Stone2, Li Ge2, and Stefan Rotter2,3 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2Department of Applied Physics, Yale University, New Haven, CT 06520, USA — 3Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria
Novel laser designs have emerged recently due to modern nanofabrication capabilities. Striking among these are diffusive random lasers (DRLs) which have no resonator to trap light and no high-Q resonances to support lasing. Due to this lack of sharp resonances the DRL has presented a challenge to conventional laser theory, leading to controversy over their correct description. We recently presented a theory able to treat the DRL rigorously, and provided results on the lasing spectra, internal fields and output intensities of DRLs (Science 320, 643, 2008). DRLs are always multimode lasers, i.e. they emit light at a range of wavelengths. I will show that the modal interactions through the gain medium in such lasers are extremely strong and lead to a uniformly spaced frequency spectrum, in agreement with recent experimental observations. Non-hermitian character of the system is correctly captured, resulting in lasing modes which have an average spatial growth towards the loss-boundary.