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Journal of Nanophotonics

Monte Carlo calculations of spectral features in random lasing
Author(s): Sushil Mujumdar; Renato Torre; Hema Ramachandran; Diederik S. Wiersma
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Paper Abstract

Continuing our ongoing investigations of random lasing, we used the Monte Carlo method to simulate random walks of photons within a multiply scattering medium. By initially applying this technique to calculate pulse-stretching in a passive disordered medium, we elucidated its agreement with analytical diffusion theory. Thereafter, we introduced conditions of optical amplification, and reproduced the experimentally observed spectral features like spectral narrowing, intensity enhancement, bichromaticity, mode competition, etc., in a random laser. After investigating diffusive and sub-diffusive regimes of scattering, we formulated our results in terms of a gain subvolume, the functioning of which depends upon local gain conditions. We then used a modified approach of this technique to study ultranarrow random lasing modes, and successfully reproduced these modes observed in a random laser. Based on our simulations, we were able to explain the origins of ultra-narrow lasing modes as excessively amplified extended modes.

Paper Details

Date Published: 1 March 2010
PDF: 13 pages
J. Nanophoton. 4(1) 041550 doi: 10.1117/1.3388717
Published in: Journal of Nanophotonics Volume 4, Issue 1
Show Author Affiliations
Sushil Mujumdar, Tata Institute of Fundamental Research (India)
Renato Torre, Univ. degli Studi di Firenze (Italy)
Hema Ramachandran, Raman Research Institute (India)
Diederik S. Wiersma, Univ. degli Studi di Firenze (Italy)

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