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Phys Rev Lett. 2005 Feb 25;94(7):073901. Epub 2005 Feb 23.

Photon localization laser: low-threshold lasing in a random amplifying layered medium via wave localization.

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  • 1Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA.


We demonstrate low-threshold lasing in random amplifying layered medium via photon localization. Lasing is facilitated by resonant excitation of localized modes at the pump laser wavelength, which are peaked deep within the sample with greatly enhanced intensity. Emission occurs into long-lived localized modes overlapping the localized gain region. This mechanism overcomes a fundamental barrier to reducing lasing thresholds in diffusive random lasers, in which multiple scattering restricts the excitation region to the proximity of the sample surface.

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