Spectral and coherence signatures of threshold in random lasers

We investigated the spectral and coherence signatures of threshold in random lasers with incoherent feedback consisting of alumina colloidal nanoparticles suspended in rhodamine 6G methanol solution under nanosecond-pulsewidth pumping, based on measurement of temporal and spatial coherence propertie...

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Main Authors: Deming, Liu,, Sandhya, Clement,, David W., Coutts,, Ewa M., Goldys,, Judith M., Dawes,, Wan Zakiah, Wan Ismail,
Format: Article
Language:en_US
Published: Iop Publishing Ltd 2015
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Online Access:http://ddms.usim.edu.my/handle/123456789/8410
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spelling my.usim-84102017-02-23T02:45:14Z Spectral and coherence signatures of threshold in random lasers Deming, Liu, Sandhya, Clement, David W., Coutts, Ewa M., Goldys, Judith M., Dawes, Wan Zakiah, Wan Ismail, Random Lasers Lasing Threshold Emission Spectra Coherence properties We investigated the spectral and coherence signatures of threshold in random lasers with incoherent feedback consisting of alumina colloidal nanoparticles suspended in rhodamine 6G methanol solution under nanosecond-pulsewidth pumping, based on measurement of temporal and spatial coherence properties and comparison with emission spectra. Feedback in this random laser was provided by multiple scattering from the alumina particles, and the effects of particle concentration and scattering length were studied for the weakly scattering and diffusive scattering regimes. At threshold, in each regime, the visibility of the interference fringes jumped abruptly, coinciding with a substantial increase in peak emission intensity and decrease in the linewidth of a single dominant emission peak. 2015-06-19T01:34:33Z 2015-06-19T01:34:33Z 2014-01-01 Article 2040-8978 2040-8986 http://ddms.usim.edu.my/handle/123456789/8410 en_US Iop Publishing Ltd
institution Universiti Sains Islam Malaysia
building USIM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universit Sains Islam i Malaysia
content_source USIM Institutional Repository
url_provider http://ddms.usim.edu.my/
language en_US
topic Random Lasers
Lasing Threshold
Emission Spectra
Coherence properties
spellingShingle Random Lasers
Lasing Threshold
Emission Spectra
Coherence properties
Deming, Liu,
Sandhya, Clement,
David W., Coutts,
Ewa M., Goldys,
Judith M., Dawes,
Wan Zakiah, Wan Ismail,
Spectral and coherence signatures of threshold in random lasers
description We investigated the spectral and coherence signatures of threshold in random lasers with incoherent feedback consisting of alumina colloidal nanoparticles suspended in rhodamine 6G methanol solution under nanosecond-pulsewidth pumping, based on measurement of temporal and spatial coherence properties and comparison with emission spectra. Feedback in this random laser was provided by multiple scattering from the alumina particles, and the effects of particle concentration and scattering length were studied for the weakly scattering and diffusive scattering regimes. At threshold, in each regime, the visibility of the interference fringes jumped abruptly, coinciding with a substantial increase in peak emission intensity and decrease in the linewidth of a single dominant emission peak.
format Article
author Deming, Liu,
Sandhya, Clement,
David W., Coutts,
Ewa M., Goldys,
Judith M., Dawes,
Wan Zakiah, Wan Ismail,
author_facet Deming, Liu,
Sandhya, Clement,
David W., Coutts,
Ewa M., Goldys,
Judith M., Dawes,
Wan Zakiah, Wan Ismail,
author_sort Deming, Liu,
title Spectral and coherence signatures of threshold in random lasers
title_short Spectral and coherence signatures of threshold in random lasers
title_full Spectral and coherence signatures of threshold in random lasers
title_fullStr Spectral and coherence signatures of threshold in random lasers
title_full_unstemmed Spectral and coherence signatures of threshold in random lasers
title_sort spectral and coherence signatures of threshold in random lasers
publisher Iop Publishing Ltd
publishDate 2015
url http://ddms.usim.edu.my/handle/123456789/8410
_version_ 1645152411980922880
score 13.222552