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

doi:10.1088/2040-8978/16/10/105008

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

^*Corresponding author for this work

MQ Photonics Research Centre

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

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.

Original language	English
Article number	105008
Pages (from-to)	1-9
Number of pages	9
Journal	Journal of Optics (United Kingdom)
Volume	16
Issue number	10
DOIs	https://doi.org/10.1088/2040-8978/16/10/105008
Publication status	Published - Oct 2014

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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.",

author = "Ismail, {Wan Zakiah Wan} and Deming Liu and Sandhya Clement and Coutts, {David W.} and Goldys, {Ewa M.} and Dawes, {Judith M.}",

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AU - Ismail, Wan Zakiah Wan

AU - Liu, Deming

AU - Clement, Sandhya

AU - Coutts, David W.

AU - Goldys, Ewa M.

AU - Dawes, Judith M.

PY - 2014/10

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AB - 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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EP - 9

JO - Journal of Optics

JF - Journal of Optics

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Spectral and coherence signatures of threshold in random lasers

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