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Proceedings Paper

Fibre laser using a microchannel based loss tuning element for refractive index sensing
Author(s): Chengbo Mou; Kaiming Zhou; Edward Davies; Lin Zhang; Ian Bennion
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Paper Abstract

We have proposed and demonstrated a fibre laser system using a microchannel as a cavity loss tuning element for surrounding medium refractive index (SRI) sensing. A ~6μm width microchannel was created by femtosecond (fs) laser inscription assisted chemical etching in the cavity fibre, which offers a direct access to the external liquids. When the SRI changes, the microchannel behaves as a loss tuning element, hence modulating the laser cavity loss and output power. The results indicate that the presented laser sensing system has a linear response to the SRI with a sensitivity in the order of 10-5. Using higher pump power and more sensitive photodetector, the SRI sensitivity could be further enhanced.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035D (5 October 2009); doi: 10.1117/12.834749
Show Author Affiliations
Chengbo Mou, Aston Univ. (United Kingdom)
Kaiming Zhou, Aston Univ. (United Kingdom)
Edward Davies, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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