Title:	Lasing in active, sub-mean-free path-sized systems with dense, random, weak scatterers
Authors:	Prasad, B.R. Ramachandran, Hema Sood, A.K. Subramanian, C.K. Kumar, N.
Issue Date:	Oct-1997
Publisher:	Optical Society of America
Citation:	Applied Optics, 1997, Vol.36, p7718-7724
Abstract:	We report enhanced emission and gain narrowing in Rhodamine 590 perchlorate dye in an aqueous suspension of polystyrene microspheres. A systematic experimental study of the threshold condition for and the gain narrowing of the stimulated emission over a wide range of dye concentrations and scatterer number densities showed several interesting features, even though the transport mean free path far exceeded the system size. The conventional diffusive-reactive approximation to radiative transfer in an inhomogeneously illuminated random amplifying medium, which is valid for a transport mean-free path much smaller than the system size, is clearly inapplicable here. We propose a new probabilistic approach for the present case of dense, random, weak scatterers involving the otherwise rare and ignorable sub-mean-free-path scatterings, now made effective by the high gain in the medium, which is consistent with experimentally observed features.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/3013
ISSN:	0003-6935 1539-4522 (Online)
Alternative Location:	http://www.opticsinfobase.org/abstract.cfm?URI=ao-36-30-7718
Copyright:	1997 Optical Society of America
Appears in Collections:	Research Papers (LAMP)

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