Refractive index sensor based on F-P interferometer cavity in optical fiber with double-openings
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Corresponding author:
QU Shiliang, slqu@hit.edu.cn
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Received Date:
2013-12-24
Accepted Date:
2014-03-11
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Abstract
In order to achieve a high sensitive fiber sensor for liquid refractive index (RI) measurement through a simple and efficient method, a Fabry-Prot interferometer (F-PI) cavity in fiber with double-openings was fabricated by femtosecond laser micromachining followed by fiber fusion. Firstly a rectangular groove was ablated at the end of fiber by femtosecond laser direct writing. Then the fiber end with the groove was spliced with another fiber end to form the F-PI cavity with double-openings. The responses of the fiber sensor based on the F-PI cavity with double-openings to the liquid RI and temperature were investigated. The experiment results show that the sensitivity of the sensor for RI measurement can achieve 1107.76nm/RIU, and the crosstalk by temperature is less than 0.0025nm/℃. The application of the sensor for seawater salinity measurement was also discussed and its sensitivity achieves 0.171nm/(mgmL-1). This liquid RI fiber sensor based on the F-PI cavity with double-openings can have great application in the fields of biology, medicine, chemistry and environment due to its advantages of high constrast of the reflection spectrum, linear response, high sensitivity, low crosstalk of temperature, small size and simple fabrication.
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