Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser 
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Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
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Fig. 1. Schematic diagram of the proposed EFPI.
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Fig. 2. Microscope images of the (a) fiber end face A, (b) fiber end face B, and (c) whole assembly.
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Fig. 3. Experiment setup of RI sensing.
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Fig. 4. Spectrum of the EFPI in air.
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Fig. 5. Spectra of the EFPI filled with a NaCl solution (5%–10%).
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Fig. 6. Amplification of part of the spectra.
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Fig. 7. Wavelength shifts versus RI for the EFPI.
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Fig. 8. Spectrum of the sensor in water with a cavity length of 358.5 μm.
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Fig. 9. Wavelength shifts for the sensor with a cavity length of 358.5 μm.
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Fig. 10. 11×81 values of the demodulated cavity length Lf.
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Fig. 11. Cavity length Lf variations versus RI for the EFPI.
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Fig. 12. Cavity length Lf variations versus temperature, from 30°C to 60°C.
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Pengfei Liu, Lan Jiang, Sumei Wang, Zhitao Cao, Peng Wang. Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser[J]. Chinese Optics Letters, 2016, 14(2): 020602.
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