Rayleigh backscattering : a method to highly compress laser linewidth

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

21 Scopus Citations
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Author(s)

  • Tao Zhu
  • Shihong Huang
  • Leilei Shi
  • Wei Huang
  • Min Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)4631-4636
Journal / PublicationChinese Science Bulletin
Volume59
Issue number33
Online published6 Sep 2014
Publication statusPublished - Nov 2014

Abstract

Ultra-narrow linewidth laser with several hundred hertz at room temperature has attracted a great deal of attention in recent years and played a critical role in both optical sensing and communication fields. In this paper, a new method based on Rayleigh backscattering to highly compress the laser linewidth was proposed and demonstrated theoretically and experimentally. By theoretical analysis and simulation, Rayleigh backscattering can be collected in any waveguide structure and all wave bands, which could have a revolutionary impact on the field of laser. A single-longitudinal mode fiber ring laser with 130-Hz linewidth was achieved with self-injection feedback structure at normal atmospheric temperature. The linewidth compression based on Rayleigh backscattering lies in the fact that laser linewidth after scattering is narrower than that of incident light in high Rayleigh scattering structure. The self-rejection feedback method expanding free spectra range of laser cavity simultaneously was used to further suppress the mode-hopping and stabilizing output. Experimental results showed that the laser linewidth can be easily narrowed to hundreds of hertz with side-mode suppression up to 75 dB. This agrees with the theoretical analysis and simulation results qualitatively.

Research Area(s)

  • Linewidth compressing, Narrow linewidth laser, Rayleigh backscattering, Self-injection feedback

Citation Format(s)

Rayleigh backscattering : a method to highly compress laser linewidth. / Zhu, Tao; Huang, Shihong; Shi, Leilei; Huang, Wei; Liu, Min; Chiang, Kinseng.

In: Chinese Science Bulletin, Vol. 59, No. 33, 11.2014, p. 4631-4636.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal