Fibre laser using a microchannel based loss tuning element for refractive index sensing

Chengbo Mou; Kaiming Zhou; Edward Davies; Lin Zhang; Ian Bennion

doi:10.1117/12.834749

5 October 2009 Fibre laser using a microchannel based loss tuning element for refractive index sensing

Chengbo Mou, Kaiming Zhou, Edward Davies, Lin Zhang, Ian Bennion

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75035D (2009) https://doi.org/10.1117/12.834749
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

Chengbo Mou, Kaiming Zhou, Edward Davies, Lin Zhang, and Ian Bennion "Fibre laser using a microchannel based loss tuning element for refractive index sensing", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035D (5 October 2009); https://doi.org/10.1117/12.834749

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