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Sensors 2018, 18(9), 3003; https://doi.org/10.3390/s18093003

Sensing Characteristics of Tilted Long Period Fiber Gratings Inscribed by Infrared Femtosecond Laser

1
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2
Guangxi Colleges and Universities Key Laboratory of Microwave and Optical Wave-applied Technology, Guilin 541004, China
*
Author to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 3 September 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Optical Waveguide Based Sensors)
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Abstract

We propose a novel tilted long period fiber grating (TLPFG) design, inscribed using a line-by-line inscription technique and an infrared femtosecond (Fs) laser. The responses of this TLPFG to external refractive index, temperature, torsion, and strain were systematically investigated to determine its sensing characteristics. The external refractive index (RI) was measured to be −602.86 nm/RIU at an RI of ~1.432. The TLPFG was used to accurately measure temperatures up to 450 °C with a sensitivity of 103.8 pm/°C. The torsion and strain sensitivity of the device were 48.94 nm/(rad/mm) and −0.63 pm/µε, respectively. These results demonstrate that the proposed TLPFG could be used as sensors in a series of application fields including high temperatures and external environments. View Full-Text
Keywords: femtosecond laser; TLPFG; optical fiber sensor; sensing properties femtosecond laser; TLPFG; optical fiber sensor; sensing properties
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Tang, J.; Fu, C.; Bai, Z.; Liao, C.; Wang, Y. Sensing Characteristics of Tilted Long Period Fiber Gratings Inscribed by Infrared Femtosecond Laser. Sensors 2018, 18, 3003.

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