Special Section on Nanostructures Honoring Craig F. Bohren

Monte Carlo calculations of spectral features in random lasing

[+] Author Affiliations
Sushil Mujumdar

Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai, 400005 India

Renato Torre

European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara, 1, Florence, 50019 Italy

Hema Ramachandran

Raman Research Institute, CV Raman Avenue, Sadashivnagar, Bangalore 560080 India

Diederik Wiersma

European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara, 1, Florence, 50019 Italy

J. Nanophoton. 4(1), 041550 (March 23, 2010). doi:10.1117/1.3388717
History: Received December 7, 2009; Revised March 19, 2010; Accepted March 22, 2010; March 23, 2010; Online March 23, 2010
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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.

© 2010 Society of Photo-Optical Instrumentation Engineers

Topics

Random lasers

Citation

Sushil Mujumdar ; Renato Torre ; Hema Ramachandran and Diederik Wiersma
"Monte Carlo calculations of spectral features in random lasing", J. Nanophoton. 4(1), 041550 (March 23, 2010). ; http://dx.doi.org/10.1117/1.3388717


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