Random lasers ensnared

Marco Leonetti; Cefe López

doi:10.1117/12.923852

25 April 2012 Random lasers ensnared

Marco Leonetti, Cefe López

Proceedings Volume 8425, Photonic Crystal Materials and Devices X; 84251B (2012) https://doi.org/10.1117/12.923852
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

A random laser is formed by a haphazard assembly of nondescript optical scatters with optical gain. Multiple light scattering replaces the optical cavity of traditional lasers and the interplay between gain, scattering and size determines its unique properties. Random lasers studied till recently, consisted of irregularly shaped or polydisperse scatters, with some average scattering strength constant across the gain frequency band. Photonic glasses can sustain scattering resonances that can be placed in the gain window, since they are formed by monodisperse spheres [1]. The unique resonant scattering of this novel material allows controlling the lasing color via the diameter of the particles and their refractive index. Thus a random laser with a priori set lasing peak can be designed [2]. A special pumping scheme that enables to select the number of activated modes in a random laser permits to prepare RLs in two distinct regimes by controlling directionality through the shape of the pump [3]. When pumping is essentially unidirectional, few (barely interacting) modes are turned on that show as sharp, uncorrelated peaks in the spectrum. By increasing angular span of the pump beams, many resonances intervene generating a smooth emission spectrum with a high degree of correlation, and shorter lifetime. These are signs of a phaselocking transition, in which phases are clamped together so that modes oscillate synchronously.

Citation Download Citation

Marco Leonetti and Cefe López "Random lasers ensnared", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84251B (25 April 2012); https://doi.org/10.1117/12.923852

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KEYWORDS

Random lasers

Scattering

Laser scattering

Photonic glasses

Optical spheres

Light scattering

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