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Science 2 May 2008:
Vol. 320. no. 5876, pp. 643 - 646
DOI: 10.1126/science.1155311
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Reports

Strong Interactions in Multimode Random Lasers

Hakan E. Türeci,1* Li Ge,2 Stefan Rotter,2{dagger} A. Douglas Stone2

Unlike conventional lasers, diffusive random lasers (DRLs) have no resonator to trap light and no high-Q resonances to support lasing. Because of this lack of sharp resonances, the DRL has presented a challenge to conventional laser theory. We present a theory able to treat the DRL rigorously and provide results on the lasing spectra, internal fields, and output intensities of DRLs. Typically DRLs are highly multimode lasers, emitting light at a number of wavelengths. We 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.

1 Institute of Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zurich, 8093 Zurich, Switzerland.
2 Department of Applied Physics, Post Office Box 208284, Yale University, New Haven, CT 06520–8284, USA.

{dagger} Presently on leave from Technische Universitat Wien, Wiedner Hauptstraße 8-10/136, A-1040 Vienna, Austria.

* To whom correspondence should be addressed. E-mail: tureci{at}phys.ethz.ch

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Science. ISSN 0036-8075 (print), 1095-9203 (online)