Optical fibre cavity for ring-down experiments with low coupling losses

M. Fabian, E. Lewis, T. Newe, S. Lochmann

Research output: Contribution to journalArticlepeer-review

Abstract

A fibre-cavity design based on highly reflective gold coatings, vapour deposited to the two end faces of a large core multimode waveguide, is presented. In contrast to common fibre-cavity approaches, the laser pulses are not coupled through the reflective coatings into the cavity but through a micro hole in one of the fibre end faces, which reduces the commonly very high coupling loss to less than 1%. Accordingly, lower demands on the source power and the sensitivity of the receiver circuit result in lower costs of ring-down sensor approaches. The scope of the paper is on the proof of principle and the characterization of the novel fibre-cavity design. Nevertheless, potential applications are briefly addressed at the end of the paper.

Original languageEnglish
Article number094034
JournalMeasurement Science and Technology
Volume21
Issue number9
DOIs
Publication statusPublished - 28 Jul 2010

Keywords

  • Fibre cavity
  • Optical fibre sensor
  • Ring-down spectroscopy

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