3D finite element model for writing long-period fiber gratings by CO2 laser radiation

In the last years, mid-infrared radiation emitted by CO2 lasers has become increasing popular as a tool in the development of long-period fiber gratings. However, although the development and characterization of the resulting sensing devices have progressed quickly, further research is still necessa...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2013-08, Vol.13 (8), p.10333-10347
Main Authors: Coelho, João M P, Nespereira, Marta, Abreu, Manuel, Rebordão, José
Format: Article
Language:English
Subjects:
Computer Simulation
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology - instrumentation
fiber-based sensors
Finite Element Analysis
finite element modeling
Heat
Infrared radiation
laser processing
Lasers
Lasers, Gas
long-period fiber gratings
Models, Theoretical
refractive-index modulation
Refractometry - instrumentation
Sensors
thermo-mechanical processes
Writing
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Summary:In the last years, mid-infrared radiation emitted by CO2 lasers has become increasing popular as a tool in the development of long-period fiber gratings. However, although the development and characterization of the resulting sensing devices have progressed quickly, further research is still necessary to consolidate functional models, especially regarding the interaction between laser radiation and the fiber's material. In this paper, a 3D finite element model is presented to simulate the interaction between laser radiation and an optical fiber and to determine the resulting refractive index change. Dependence with temperature of the main parameters of the optical fiber materials (with special focus on the absorption of incident laser radiation) is considered, as well as convection and radiation losses. Thermal and residual stress analyses are made for a standard single mode fiber, and experimental results are presented.
ISSN:1424-8220
1424-8220
DOI:10.3390/s130810333