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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 30 — Oct. 20, 1997
  • pp: 7718–7724

Lasing in active, sub-mean-free path-sized systems with dense, random, weak scatterers

B. Raghavendra Prasad, Hema Ramachandran, Ajay Kumar Sood, C. K. Subramanian, and Narendra Kumar  »View Author Affiliations


Applied Optics, Vol. 36, Issue 30, pp. 7718-7724 (1997)
http://dx.doi.org/10.1364/AO.36.007718


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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.

© 1997 Optical Society of America

History
Original Manuscript: July 11, 1996
Published: October 20, 1997

Citation
B. Raghavendra Prasad, Hema Ramachandran, Ajay Kumar Sood, C. K. Subramanian, and Narendra Kumar, "Lasing in active, sub-mean-free path-sized systems with dense, random, weak scatterers," Appl. Opt. 36, 7718-7724 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-30-7718

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