Spectral and coherence signatures of threshold in random lasers

被引：25

作者：

Ismail, Wan Zakiah Wan ^{[1
,2
,3
]}

Liu, Deming ^{[1
]}

Clement, Sandhya ^{[1
]}

Coutts, David W. ^{[1
,2
]}

Goldys, Ewa M. ^{[1
]}

Dawes, Judith M. ^{[1
,2
]}

机构：

[1] Macquarie Univ, Dept Phys & Astron, MQ Photon Res Ctr, N Ryde, NSW 2109, Australia

[2] ARC Ctr Excellence, Ctr Ultrahigh Bandwidth Devices Opt Syst CUDOS, Melbourne, Vic, Australia

[3] Islamic Sci Univ Malaysia, Fac Sci, Nilai 71800, Negeri Sembilan, Malaysia

来源：

JOURNAL OF OPTICS | 2014年 / 16卷 / 10期

关键词：

random lasers; lasing threshold; emission spectra; coherence properties; NANOPARTICLES; EMISSION;

D O I：

10.1088/2040-8978/16/10/105008

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：9

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