Spatial threshold in amplifying random media
Optics Letters, Vol. 35, Issue 18, pp. 3063-3065 (2010)
http://dx.doi.org/10.1364/OL.35.003063
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Abstract
We study experimentally as well as numerically the transport and generation of light in multiple scattering media with optical gain. By imaging the spatial distribution of light escaping from the side of the sample, the propagation depth is analyzed. Far below and far above random laser threshold, the spatial profile of emission light is independent of pump intensity, while around threshold, the spatial distribution of emission light changes profoundly. The experimental results are explained by interpreting the numerical solutions to a set of coupled time-dependent diffusion equations on a nonuniform spatial grid. Our studies provide a new and easily accessible method for observing the random laser threshold.
© 2010 Optical Society of America
OCIS Codes
(140.2050) Lasers and laser optics : Dye lasers
(140.3460) Lasers and laser optics : Lasers
(290.4210) Scattering : Multiple scattering
ToC Category:
Lasers and Laser Optics
History
Original Manuscript: June 1, 2010
Manuscript Accepted: July 28, 2010
Published: September 8, 2010
Citation
Ramy G. S. El-Dardiry, Allard P. Mosk, and Ad Lagendijk, "Spatial threshold in amplifying random media," Opt. Lett. 35, 3063-3065 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-18-3063
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