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Title: Long period grating in a multimode cyclic transparent optical polymer fiber inscribed using a femtosecond laser
Authors: Theodosiou, Antreas 
Min, Rui 
Leal-Junior, Arnaldo 
Ioannou, Andreas 
Frizera, Anselmo 
Pontes, Maria José 
Marques, Carlos Alberto F. 
Kalli, Kyriacos 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Femtosecond lasers;Fiber optic sensors;Polymers;Relative humidity and temperatures;Femtosecond laser inscriptions;Temperature sensitivity;Unexposed regions
Issue Date: 2019
Source: Optics Letters, 2019, vol. 44, no. 21, pp. 5346-5349
Volume: 44
Issue: 21
Start page: 5346
End page: 5349
Journal: Optics Letters 
Abstract: In this Letter, we report, to the best of our knowledge, the first inscription of long period gratings (LPGs) in a multimode cyclic transparent optical polymer (CYTOP) fiber using a femtosecond laser inscription method. The LPG was inscribed directly in the center of the fiber core, tailored for operation at 1560 nm. The CYTOP-LPG was characterized in transmission, and its response for relative humidity and temperature was measured. The humidity measurements, to the best our knowledge, are the first for a POF-LPG, whereas the temperature sensitivity is significantly higher than reported in other works. In addition, dynamic mechanical measurements were performed comparing the mechanical characteristics of the laser exposed sections of the polymer fiber, where the LPG was inscribed, with the unexposed regions.
ISSN: 1539-4794
DOI: 10.1364/OL.44.005346
Rights: © Optical Society of America
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Cyprus University of Technology 
Universitat Politècnica de València 
Federal University of Espírito Santo 
University of Mons 
University of Aveiro 
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