Spectral and coherence signatures of threshold in random lasers

Wan Zakiah Wan Ismail, Deming Liu, Sandhya Clement, David W. Coutts, Ewa M. Goldys, Judith M. Dawes

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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.

LanguageEnglish
Article number105008
Pages1-9
Number of pages9
JournalJournal of Optics (United Kingdom)
Volume16
Issue number10
DOIs
Publication statusPublished - 4 Sep 2014

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spectral signatures
Aluminum Oxide
signatures
Scattering
thresholds
Lasers
Alumina
scattering
lasers
Feedback
aluminum oxides
Multiple scattering
Visibility
Linewidth
Methanol
rhodamine
visibility
Nanoparticles
pumping
emission spectra

Cite this

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title = "Spectral and coherence signatures of threshold in random lasers",
abstract = "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.",
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Spectral and coherence signatures of threshold in random lasers. / Ismail, Wan Zakiah Wan; Liu, Deming; Clement, Sandhya; Coutts, David W.; Goldys, Ewa M.; Dawes, Judith M.

In: Journal of Optics (United Kingdom), Vol. 16, No. 10, 105008, 04.09.2014, p. 1-9.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Dawes, Judith M.

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