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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.
ISSN: 0003-6935
1539-4522 (Online)
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Copyright: 1997 Optical Society of America
Appears in Collections:Research Papers (LAMP)

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