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Resonance-driven random lasing

AuthorsGottardo, Stefano; Sapienza, R. ; García, Pedro David; Blanco Montes, Álvaro ; Wiersma, Diederik S.; López, Cefe
KeywordsRandom lasers
Elastic scatterers
Scattering resonances
Lasing wavelength control
Monodisperse spheres
Issue Date15-Jun-2008
PublisherNature Publishing Group
CitationNature Photonics 2: 429-432 (2008)
AbstractA random laser is a system formed by a random assembly of elastic scatterers dispersed into an optical gain medium. The multiple light scattering replaces the standard optical cavity of traditional lasers and the interplay between gain and scattering determines the lasing properties. All random lasers studied to date have consisted of irregularly shaped or polydisperse scatterers, with a certain average scattering strength that was constant over the frequency window of the laser. In this letter we consider the case where the scattering is resonant. We demonstrate that randomly assembled monodisperse spheres can sustain scattering resonances over the gain frequency window, and that the lasing wavelength can therefore be controlled by means of the diameter and refractive index of the spheres. The system is therefore a random laser with an a priori designed lasing peak within the gain curve.
Description4 pages, 4 figures.-- Supplementary material available at http://dx.doi.org/10.1038/nphoton.2008.102: Fig. 1: Ohm's law fit for photonic glass, Fig. 2: Two dyes photonic glass reference sample.
Publisher version (URL)http://dx.doi.org/10.1038/nphoton.2008.102
Appears in Collections:(ICMM) Artículos
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