Suspended-core fibres as optical gas sensing cells: study and implementation

Isabelle Dicaire; Jean-Charles Beugnot; Luc Thévenaz

doi:10.1117/12.820791

20 May 2009 Suspended-core fibres as optical gas sensing cells: study and implementation

Isabelle Dicaire, Jean-Charles Beugnot, Luc Thévenaz

Proceedings Volume 7357, Photonic Crystal Fibers III; 73570U (2009) https://doi.org/10.1117/12.820791
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

We have thoroughly studied and modelled many important aspects for the realization of gas-light interactions in suspended-core fibres. The fraction of the optical field propagating in holes could be calculated from the fibre geometry to predict the total absorption for a given molecular absorption line and fibre length. In addition, the gas diffusion into the fibre holes could be modelled to precisely anticipate the filling time for a given fibre geometry and length. This was experimentally validated by preparing several samples of suspended-core fibres showing various lengths. These samples were filled with acetylene at low pressure (< 50 mbar) and were hermetically and permanently sealed by fusion splicing each fibre end to a plain single-mode silica fibre. The adequacy between the modelling and the experimental results turned out to be excellent. Several physical parameters essential for the fibre characterization could be extracted from a set of measurements, sketching a specific metrological approach dedicated to this type of fibre. Finally, applications and advanced experiments that can be specifically carried out using these fibres are discussed.

Citation Download Citation

Isabelle Dicaire, Jean-Charles Beugnot, and Luc Thévenaz "Suspended-core fibres as optical gas sensing cells: study and implementation", Proc. SPIE 7357, Photonic Crystal Fibers III, 73570U (20 May 2009); https://doi.org/10.1117/12.820791

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