Phys. Rev. Lett. 93, 053903 (2004) [4 pages]Amplified Extended Modes in Random Lasers
See accompanying Physics Focus We report on a new random laser phenomenon that gives rise to narrow emission modes without requiring optical cavities. Sharp emission peaks are observed experimentally over a broad range of scattering strengths and analyzed in numerical calculations. We find that the introduction of exponential gain in a multiple light scattering process strongly increases the importance of very long light paths. Such long paths are rare and often neglected in passive disordered materials but we show that they can dominate the emission spectrum from an amplifying disordered system. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.053903
DOI:
10.1103/PhysRevLett.93.053903
PACS:
42.55.Zz, 42.25.Dd, 42.25.Hz
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