Common path Bessel beam optical interferometry for refractive index measurement of hazardous liquid samples at 1550nm

This article presents a packaged optical fiber axicon tip generating high-quality Bessel beam and Bessel beam optical interferometry for measuring the Refractive Index of hazardous liquid like HCL, H2SO4 at 1550nm. The measurement resolution of our system is 1×10-3± 0.0007. The packaged axicon feeds with broadband amplified spontaneous emission source through an optical circulator. Packaged axicon tip is dipped in different concentrations of liquid samples. The light reflects from the air-glass and glass-liquid interfaces, couples back to the optical fiber axicon tip, interferes with the reference beam generated at the air-axicon interface. The interference spectra are recorded in an optical spectrum analyzer via the third port of the circulator. The interference spectra are analyzed by applying fast Fourier transform. The FFT differentiates the power reflected from different interfaces which helps in solving the Fresnel equation to calculate the solution's RI as the glass RI is known.

[1]  Alexey N. Bashkatov,et al.  Water refractive index in dependence on temperature and wavelength: a simple approximation , 2003, Saratov Fall Meeting.

[2]  L. Nguyen,et al.  All-fiber all-optical quantitative polymerase chain reaction (qPCR) , 2020, Sensors and Actuators B: Chemical.

[3]  J. S. Lewis.  Refractive Index of Aqueous HCl Solutions and the Composition of the Venus Clouds , 1971, Nature.

[4]  S. Mondal,et al.  Packaged Negative Axicon Optical Fiber Probe and Bessel Beam Interferometry for Refractive Index Measurement of Hazardous Liquid Samples , 2019, Journal of Lightwave Technology.

[5]  S. Khanna,et al.  U-bent fiber optic plasmonic biosensor platform for ultrasensitive analyte detection , 2020 .

[6]  S. Mondal,et al.  Solving Fresnel equation for refractive index using reflected optical power obtained from Bessel beam interferometry. , 2019, The Review of scientific instruments.

[7]  Jochen Fick,et al.  Common-Path Optical Coherence Tomography Using the Bessel Beam From Negative Axicon Optical Fiber Tip , 2019, IEEE Journal of Selected Topics in Quantum Electronics.

[8]  Umesh Tiwari,et al.  Deep Seated Negative Axicon in Selective Optical Fiber Tip and Collimated Bessel Beam , 2017, IEEE Photonics Technology Letters.

[9]  Tonglei Cheng,et al.  High-Sensitivity SPR Temperature Sensor Based on Hollow-Core Fiber , 2020, IEEE Transactions on Instrumentation and Measurement.

[10]  A. Zhang,et al.  Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor , 2005, IEEE Photonics Technology Letters.

[11]  Jia-Rong Zhao,et al.  A Fresnel-reflection-based fiber sensor for simultaneous measurement of liquid concentration and temperature , 2009 .