Journal article
Frequency behavior of coherent random lasing in diffusive resonant media
Photonics and nanostructures, Vol.10(4), pp.416-422
10/01/2012
DOI: 10.1016/j.photonics.2012.04.001
Abstract
We investigate diffusive propagation of light and consequent random lasing in an amplifying medium comprising resonant spherical scatterers. A Monte-Carlo calculation based on photon propagation via three-dimensional random walks is employed to obtain the dwell-times of light in the system. We compare the inter-scatterer and intra-scatterer dwell-times for representative resonant and non-resonant wavelengths. Our results show that more efficient random lasing, with intense coherent modes, is obtained for a system with intra-scatterer gain. This is also coupled with a larger reduction in frequency fluctuations. We find that such a system can yield almost thresholdless random lasing. Inspired by these results, we discuss a possible practical situation, based on a monodisperse aerosol, wherein frequency controlled coherent random lasing can be obtained. Since our analysis essentially investigates transport of intensity, the results are relevant to coherent random lasers under nonresonant feedback. (C) 2012 Elsevier B.V. All rights reserved.
Details
- Title: Subtitle
- Frequency behavior of coherent random lasing in diffusive resonant media
- Creators
- Anjani Kumar Tiwari - Tata Institute of Fundamental ResearchRavitej Uppu - Tata Institute of Fundamental ResearchSushil Mujumdar - Tata Institute of Fundamental Research
- Resource Type
- Journal article
- Publication Details
- Photonics and nanostructures, Vol.10(4), pp.416-422
- Publisher
- Elsevier
- DOI
- 10.1016/j.photonics.2012.04.001
- ISSN
- 1569-4410
- eISSN
- 1569-4429
- Number of pages
- 7
- Language
- English
- Date published
- 10/01/2012
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984442013102771
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