Femtosecond laser micromachining of fibre Bragg gratings for simultaneous measurement of temperature and concentration of liquids

This paper is concerned with micromachining of optical fibre Bragg gratings (FBGs) using a femtosecond pulsed laser. The purpose of this work is to increase the sensitivity of FBGs for simultaneous monitoring of the concentration of chemicals and biological liquids and their temperature. A Ti : sapp...

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Veröffentlicht in:Journal of physics. D, Applied physics Applied physics, 2008-09, Vol.41 (18), p.185101-185101 (9)
Hauptverfasser: Alemohammad, H, Toyserkani, E, Pinkerton, A J
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creator Alemohammad, H
Toyserkani, E
Pinkerton, A J
description This paper is concerned with micromachining of optical fibre Bragg gratings (FBGs) using a femtosecond pulsed laser. The purpose of this work is to increase the sensitivity of FBGs for simultaneous monitoring of the concentration of chemicals and biological liquids and their temperature. A Ti : sapphire regenerative amplifier was utilized to inscribe micro-grooves with widths of 16 and 22 mum in the cladding of the optical fibres. Due to the core-confined light propagation characteristics of FBGs, their sensitivity to the changes in the index of refraction of the surrounding medium is minimal. However, by creating micro-grooves in the cladding layer, the index of refraction of the surrounding medium becomes effective in the coupling of the propagating core modes. As the index of refraction of liquids depends on the composition and concentration, the FBG with micromachined cladding can provide enough sensitivity to be used in chemical sensing. The performance of the micromachined FBGs was investigated by immersing them in different liquid solutions of polyvinyl butyral (PVB) in ethanol and obtaining their thermal responses. Results showed that the optical response of the micromachined FBGs (i.e. red shift in Bragg wavelength) is different by up to 10% in PVB solutions in ethanol than in ethanol alone. The micromachined FBGs can be used to monitor the concentration as well as the temperature of a solution.
doi_str_mv 10.1088/0022-3727/41/18/185101
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source Institute of Physics Journals
subjects Exact sciences and technology
Fiber optics
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Gratings
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Optical elements, devices, and systems
Optics
Other fiber-optical devices
Physics
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Wave optics
Wave propagation, transmission and absorption
title Femtosecond laser micromachining of fibre Bragg gratings for simultaneous measurement of temperature and concentration of liquids
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