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An optical fiber extrinsic Fabry–Perot interferometer(EFPI) is designed and fabricated for refractive index(RI)sensing.To test the RI of liquid,the following two different methods are adopted:the wavelength tracking method and the Fourier-transform white-light interferometry(FTWLI).The sensitivities of sensors with cavity lengths of 288.1 and 358.5 μm are 702.312 nm/RIU and 396.362 μm/RIU,respectively,by the two methods.Our work provides a new kind of RI sensor with the advantages of high sensitivity,mechanical robustness,and low cross sensitivity to temperature.Also,we provide a new method to deal with gold film with a femtosecond laser.
An optical fiber extrinsic Fabry-Perot interferometer (EFPI) is designed and fabricated for refractive index (RI) sensing. Test the RI of liquid, the following two different methods are adopted: the wavelength tracking method and the Fourier-transform white-light The sensitivities of sensors with cavity lengths of 288.1 and 358.5 μm are 702.312 nm / RIU and 396.362 μm / RIU, respectively, by the two methods. Our work provides a new kind of RI sensor with the advantages of high sensitivity , mechanical robustness, and low cross sensitivity to temperature. Also, we provide a new method to deal with gold film with a femtosecond laser.