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Investigation of optical fibre amplifier loop for intracavity and ring down cavity loss measurements

Stewart, G. and Atherton, K. and Yu, Hongbo and Culshaw, B. (2001) Investigation of optical fibre amplifier loop for intracavity and ring down cavity loss measurements. Measurement Science and Technology, 12 (7). pp. 843-849. ISSN 0957-0233

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Abstract

We present the design and initial investigation of a fibre optical system which may be used both for intra-cavity and for ring-down measurements of absorption losses. The system consists of a fibre loop containing a length of erbium-doped fibre pumped at 980 nm, with gain adjustment below or above threshold for the two types of operation. The fibre loop is constructed from standard fibre optical components and includes a micro-optical gas cell. The intended application is for measurement of levels of trace gases which possess near-IR absorption lines within the gain bandwidth of the erbium fibre amplifier. We discuss the key issues involved in operation of the system and the level of sensitivity required. Our initial experimental investigations have demonstrated that ring-down times of several microseconds can be obtained, which can be altered through adjustment of the attenuation or gain factor of the loop. Gain control is one of the most important issues and we explain how this may be achieved.

Item type: Article
ID code: 7013
Keywords: optical fibre sensors, intra-cavity measurements, ring-down spectroscopy, fibre amplifiers, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 16 Oct 2008
    Last modified: 12 Mar 2012 10:46
    URI: http://strathprints.strath.ac.uk/id/eprint/7013

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