For distribution

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION

	
INFORMAL SEMINAR  on  Statistical Physics



Friday, 17 November    -    11:00 a.m.



Lecture Room 'C'- Main Building   (terrace level)

		


D. SHARMA   ( Raman Research Institute, Bangalore )

" Gaussian-to-LŽvy statistical crossover in a random amplifying medium "


Abstract

We have studied the emission from Random Amplifying Media (RAM) by 
means of experiments, theoretical analysis and Monte Carlo simulation.  
We report the crossover from the Gaussian to the LŽvy statistics in the 
ßuctuation of emission intensity from RAM and demonstrate the 
tunability of LŽvy exponent.
In order to examine the competition between the scattering and the 
gain, we studied by Monte Carlo simulation, the emission from 
conventional dye scatterer systems and the reverse case of active 
scatterers suspended in a passive bulk. The marked difference in their 
emission features, especially at high scatterings, lead us to classify 
them as the Direct RAM (D RAM) and the Reverse RAM (R RAM) 
respectively.