Strong Interactions in Multimode Random Lasers

Details Strong Interactions in Multimode Random Lasers Strong Interactions in Multimode Random Lasers

2008-05-29

arxiv.org/abs/0805.4496v1

Science 320, 643 (2008)

Physics

Optics

13 pages, 4 figures. Supplementary information available at arXiv:0805.4497

Scientific paper

10.1126/science.1155311

Unlike conventional lasers, diffusive random lasers (DRLs) 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. 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.

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