Temperature and refractive index measurements by using a microcavity engraved with femtosecond laser in multimode fiber

Rodrigo Fiorin; Jociel L. da S. Adachi; Valmir de Oliveira; Hypolito J. Kalinowski; Ricardo C. Kamikawachi; Ilda Abe

doi:10.1117/12.2265827

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23 April 2017 Temperature and refractive index measurements by using a microcavity engraved with femtosecond laser in multimode fiber

Rodrigo Fiorin, Jociel L. da S. Adachi, Valmir de Oliveira, Hypolito J. Kalinowski, Ricardo C. Kamikawachi, Ilda Abe

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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103234Q (2017) https://doi.org/10.1117/12.2265827
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We report an optical fiber multiparameter sensor for refractive index and temperature measurements. The proposed sensor is composed by a microcavity in multimode fiber, assisted by Bragg gratings (FBGs) in singlemode fiber. The microcavity is engraved in a multimode optical fiber by using the femtosecond laser micromachining. The sensor is characterized through microcavity immersion in water and based on its temperature variation. The results show that it is possible to obtain refractive index and temperature measurements with sensitivities of 1625 μW/RIU (refractive index unit) and of 0.23 μW/°C, with resolution of 1.8 × 10^-4 RIU and of 1.3°C.

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Rodrigo Fiorin, Jociel L. da S. Adachi, Valmir de Oliveira, Hypolito J. Kalinowski, Ricardo C. Kamikawachi, and Ilda Abe "Temperature and refractive index measurements by using a microcavity engraved with femtosecond laser in multimode fiber", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103234Q (23 April 2017); https://doi.org/10.1117/12.2265827

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