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Tunable fibre laser source for methane detection at 1.68µm

Barnes, W.L., Dakin, J.P., Edwards, H.O., Reekie, L., Townsend, J.E., Murray, S. and Pinchbeck, D. (1992) Tunable fibre laser source for methane detection at 1.68µm At SPIE Conference on Critical Reviews of Optical Science and Technology, United States. 08 - 11 Sep 1992.

Record type: Conference or Workshop Item (Paper)


A tunable fibre laser for spectroscopic gas detection is reported for the first time. The laser is based on a single-mode thulium doped fibre, which can operate at a wavelength around 1.684µm, corresponding to a significant absorption line for methane. The fibre laser was pumped at 786nm, a wavelength which is readily available with AlGaAs laser diodes and an optical threshold power of 43mW was observed. An in-fibre photorefractive grating was used as the wavelength-selective output coupler for the laser. Simultaneous straining and heating of the grating induced a change in lasing wavelength, and a tuning range of up to 2nm was demonstrated. This new tunable light source was configured within a methane detector and absorption spectra were recorded which demonstrate the presence of this gas. The large tuning range of the thulium fibre laser should allow the detection of many gas species with absorption bands in the wavelength region 1.65µm to 2.05µm.

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Published date: 1992
Venue - Dates: SPIE Conference on Critical Reviews of Optical Science and Technology, United States, 1992-09-08 - 1992-09-11


Local EPrints ID: 77348
PURE UUID: 59e2e945-d341-452b-a79b-e0ae59edd48a

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:32

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Author: W.L. Barnes
Author: J.P. Dakin
Author: H.O. Edwards
Author: L. Reekie
Author: J.E. Townsend
Author: S. Murray
Author: D. Pinchbeck

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