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Gas detection by cavity ring-down absorption with a fibre optic amplifier loop

Atherton, K. and Stewart, G. and Culshaw, B. (2002) Gas detection by cavity ring-down absorption with a fibre optic amplifier loop. In: Vibrational spectrocopy-based sensor systems. Proceedings of the society of photo-optical instrumentation engineers (SPIE) . SPIE, Bellingham, WA, pp. 25-31. ISBN 0819443050

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Abstract

Cavity ring-down is investigated as a technique to increase the sensitivity of optical fibre gas sensors. The ring-down cavity consists of an optical fibre loop containing a micro-optic gas cell and an erbium-doped optical fibre amplifier. The erbium fibre amplifier introduces gain into the cavity to increase the ring-down times and therefore the system sensitivity. This paper reports an investigation of the system sensitivity