Prof. Thomas Geernaert Profile

Prof. Thomas Geernaert

Professor at Vrije Univ Brussel

SPIE Involvement:

Author

Publications (44)

Proceedings Article | 20 June 2024 Presentation + Paper

Detection of fatigue weld cracks using optical frequency domain reflectometry-based strain sensing

Sergei Mikhailov, Jeroen van Wittenberghe, Geert Luyckx, Philippe Thibaux, Thomas Geernaert, Francis Berghmans

Proceedings Volume 12999, 1299907 (2024) https://doi.org/10.1117/12.3022489

KEYWORDS: Material fatigue, Fiber optics sensors, Pipes, Spatial resolution, Reflectometry, Sensors, Optical sensing, Photonics

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Proceedings Article | 3 October 2022 Presentation + Paper

Design, tolerancing, and fabrication of a freeform lightguide based on the flow-line method

S. Sorgato, L. Smeesters, M. Vervaeke, K. Rochlitz, D. Rosseel, J. Verbaenen, H. Thienpont, T. Geernaert, J. Van Erps

Proceedings Volume 12220, 122200C (2022) https://doi.org/10.1117/12.2634433

KEYWORDS: Waveguides, Nonimaging optics, Optical fabrication, Tolerancing, Surface roughness, Prototyping, Optics manufacturing

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Proceedings Article | 20 May 2022 Presentation + Paper

Influence of time-distribution in lasers subject to feedback from long FBGs

Martin Skënderas, Mennatallah A. Kandil, Spencer Jolly, Thomas Geernaert, Martin Virte

Proceedings Volume 12141, 121410C (2022) https://doi.org/10.1117/12.2621273

KEYWORDS: Fiber Bragg gratings, Reflectivity, Semiconductor lasers, Linear filtering, Chaos, Optical filters, Laser stabilization, Photonics, Switching, Laser systems engineering

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Proceedings Article | 17 May 2022 Presentation + Paper

Grating-assisted narrowband cladding mode excitation in photonic crystal fibers for surface refractometry

Olga Rusyakina, Tigran Baghdasaryan, Karima Chah, Pawel Mergo, Krzysztof Poturaj, Hugo Thienpont, Christophe Caucheteur, Francis Berghmans, Thomas Geernaert

Proceedings Volume 12139, 121390Y (2022) https://doi.org/10.1117/12.2621143

KEYWORDS: Cladding, Fiber Bragg gratings, Refractometry, Polarization, Refractive index, Photonic crystal fibers, Water, Sensors, Biosensing

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Proceedings Article | 5 March 2022 Presentation + Paper

Laser direct writing of short-range interconnect interfacing structures

J. Van Erps, K. Vanmol, T. Baghdasaryan, T. Geernaert, N. Vermeulen, H. Thienpont

Proceedings Volume 12007, 120070B (2022) https://doi.org/10.1117/12.2606030

KEYWORDS: Waveguides, Optical fibers, Single mode fibers, Photonic integrated circuits, Two photon polymerization, Fiber couplers, Scanning electron microscopy, Planar waveguides, Optical interconnects

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Proceedings Article | 17 April 2020 Presentation + Paper

Selective liquid filling of photonic crystal fibers using two-photon polymerization lithography without post-exposure development

Olga Rusyakina, Tigran Baghdasaryan, Pawel Mergo, Krzysztof Poturaj, Hugo Thienpont, Francis Berghmans, Thomas Geernaert

Proceedings Volume 11355, 113550R (2020) https://doi.org/10.1117/12.2557624

KEYWORDS: Liquids, Capillaries, Photoresist materials, Printing, Photoresist developing, Photonic crystal fibers, Polymers, Two photon polymerization, Microscopes, Lithography

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Proceedings Article | 14 April 2020 Presentation + Paper

Phase-shifted Bragg grating inscription in photonic crystal fibers by UV phase mask beam stop technique

Olga Rusyakina, Maria Konstantaki, Stavros Pissadakis, Pawel Mergo, Mariusz Makara, Tigran Baghdasaryan, Hugo Thienpont, Francis Berghmans, Thomas Geernaert

Proceedings Volume 11355, 1135511 (2020) https://doi.org/10.1117/12.2556069

KEYWORDS: Optical fibers, Phase shifts, Fiber Bragg gratings, Photonic crystal fibers, Single mode fibers, Bragg gratings, Ultraviolet radiation, Germanium, Doping, Cladding

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Proceedings Article | 1 April 2020 Presentation + Paper

Barely visible impact damage detection and location on composite materials by surface-mounted and embedded aerospace-compatible optical fibre Bragg grating sensors

Sidney Goossens, Thomas Geernaert, Zahra Sharif Khodaei, Evangelos Karachalios, Diego Saenz-Castillo, Francis Berghmans

Proceedings Volume 11354, 113540E (2020) https://doi.org/10.1117/12.2559262

KEYWORDS: Fiber Bragg gratings, Optical fibers, Sensors, Composites, Aerospace engineering, Damage detection, Structural health monitoring, Inspection, Bragg gratings

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Proceedings Article | 1 April 2020 Presentation + Paper

Fabrication and characterization of step-index biocompatible and biodegradable polyesters based optical fiber

Agnieszka Gierej, Adam Filipkowski, Dariusz Pysz, Ryszard Buczyński, Maxime Vagenende, Sandra Van Vlierberghe, Peter Dubruel, Hugo Thienpont, Thomas Geernaert, Francis Berghmans

Proceedings Volume 11355, 113550L (2020) https://doi.org/10.1117/12.2556161

KEYWORDS: Biocompatible materials, Photodynamic therapy, Optical fibers, Polymers, Signal attenuation, Refractive index, Biomedical optics, Polymer optical fibers, Optics manufacturing, Cladding

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Proceedings Article | 28 August 2019 Paper

Offshore field validation of a FBG based pressure/temperature sensor during a wireline intervention

Ji-Ying Huang, Jan Van Roosbroeck, Johan Vlekken, Bram Van Hoe, Geir Kaada, Morten Talgø, Anders Leirvik, Thomas Geernaert, Francis Berghmans, Christophe Caucheteur, Eric Lindner

Proceedings Volume 11199, 111990V (2019) https://doi.org/10.1117/12.2550528

KEYWORDS: Sensors, Fiber Bragg gratings, Quartz, Temperature metrology, Fiber optics sensors, Femtosecond phenomena, Photonics, Sensing systems, Optical fibers, Structured optical fibers

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Proceedings Article | 15 April 2019 Presentation + Paper

Towards poly(D,L-lactic acid)-based biodegradable and biocompatible polymer optical fiber

Agnieszka Gierej, Maxime Vagenende, Adam Filipkowski, Bartlomiej Siwicki, Ryszard Buczynski, Hugo Thienpont, Sandra Van Vlierberghe, Thomas Geernaert, Peter Dubruel, Francis Berghmans

Proceedings Volume 11029, 110290K (2019) https://doi.org/10.1117/12.2524698

KEYWORDS: Polymers, Signal attenuation, Polymer optical fibers, Optical fibers, Photodynamic therapy, Refractive index, In vitro testing

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Proceedings Article | 14 May 2018 Presentation + Paper

Packaged FBG based optical fiber sensor for simultaneous pressure and temperature monitoring

Ji-Ying Huang, Jan Van Roosbroeck, Johan Vlekken, Eric Daerden, Antonio Bueno Martinez, Thomas Geernaert, Francis Berghmans, Bram Van Hoe, Eric Lindner, Christophe Caucheteur

Proceedings Volume 10654, 1065409 (2018) https://doi.org/10.1117/12.2305095

KEYWORDS: Sensors, Temperature metrology, Calibration, Fiber Bragg gratings, Fiber optics sensors, Structured optical fibers, Packaging, Photonics

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Proceedings Article | 9 May 2018 Presentation + Paper

Micro-structured fiber Bragg grating based pressure sensors in a downhole-like hydrogen rich environment

Ji-Ying Huang, Jan Van Roosbroeck, Johan Vlekken, Damien Kinet, Antonio Bueno Martinez, Thomas Geernaert, Francis Berghmans, Bram Van Hoe, Eric Lindner, Christophe Caucheteur

Proceedings Volume 10680, 106800L (2018) https://doi.org/10.1117/12.2306129

KEYWORDS: Hydrogen, Sensors, Diffusion, Fiber Bragg gratings, Refractive index, Nitrogen

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Proceedings Article | 23 April 2017 Paper

Mechanical strain-amplifying transducer for fiber Bragg grating sensors with applications in structural health monitoring

Urszula Nawrot, Thomas Geernaert, Ben De Pauw, Dimitrios Anastasopoulos, Edwin Reynders, Guido De Roeck, Francis Berghmans

Proceedings Volume 10323, 1032370 (2017) https://doi.org/10.1117/12.2264614

KEYWORDS: Sensors, Transducers, Fiber Bragg gratings, Structural health monitoring, Optical fibers, Civil engineering, Spatial resolution, Temperature metrology, Adhesives, 3D modeling

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Proceedings Article | 23 April 2017 Paper

Fiber Bragg grating sensors written by femtosecond laser pulses in micro-structured fiber for downhole pressure monitoring

J.-Y. Huang, J. Van Roosbroeck, A. Bueno Martinez, T. Geernaert, F. Berghmans, C. Caucheteur, B. Van Hoe, E. Lindner, J. Vlekken

Proceedings Volume 10323, 103233D (2017) https://doi.org/10.1117/12.2264996

KEYWORDS: Calibration, Annealing, Reflectivity, Temperature metrology, Fiber Bragg gratings, Sensors, Femtosecond phenomena, Structured optical fibers, Optical fibers, Fiber optics sensors

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Proceedings Article | 23 April 2017 Paper

Fibre optic sensor based measurements of flow-induced vibration in a liquid metal cooled nuclear reactor set-up

B. De Pauw, S. Vanlanduit, K. Van Tichelen, T. Geernaert, H. Thienpont, F. Berghmans

Proceedings Volume 10323, 103238C (2017) https://doi.org/10.1117/12.2265554

KEYWORDS: Liquids, Metals, Fiber Bragg gratings, Sensors, Fiber optics sensors, Safety, Vibrometry, Optical fibers, Optical testing, Photonics

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Proceedings Article | 23 April 2017 Paper

Dynamic 3D strain measurements with embedded micro-structured optical fiber Bragg grating sensors during impact on a CFRP coupon

Sidney Goossens, Thomas Geernaert, Ben De Pauw, Alfredo Lamberti, Steve Vanlanduit, Geert Luyckx, Gabriele Chiesura, Hugo Thienpont, Francis Berghmans

Proceedings Volume 10323, 1032360 (2017) https://doi.org/10.1117/12.2263193

KEYWORDS: Carbon, Fiber optics sensors, Calibration, Aerospace engineering, Sensors, Composites, Fiber Bragg gratings, 3D metrology, Structured optical fibers, Optical fibers

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Proceedings Article | 29 April 2016 Paper

Inverse Abel transform algorithms to determine the radial profile of the photoelastic coefficient of glass optical fibers

Sophie Acheroy, Patrick Merken, Thomas Geernaert, Heidi Ottevaere, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9899, 98992F (2016) https://doi.org/10.1117/12.2227755

KEYWORDS: Photoelasticity, Fiber optics sensors, Glasses, Optical fibers, Fiber characterization, Sensors, Birefringence, Fourier theory, Algorithm development, Photoelasticity, Algorithms, Cladding, Silica, Multimode fibers, Telecommunications

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Proceedings Article | 27 April 2016 Paper

Determination of the radial profile of the photoelastic coefficient of polymer optical fibers

Sophie Acheroy, Patrick Merken, Thomas Geernaert, Heidi Ottevaere, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9886, 98861K (2016) https://doi.org/10.1117/12.2227793

KEYWORDS: Photoelasticity, Polymethylmethacrylate, Polymer optical fibers, Polymers, Fiber optics sensors, Optical fibers, Fiber characterization, Multimode fibers, Algorithms, Fourier theory, Microscopes

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Proceedings Article | 27 April 2016 Paper

A numerical study on the importance of non-uniform index modification during femtosecond grating inscription in microstructured optical fibers

Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9886, 98860A (2016) https://doi.org/10.1117/12.2229341

KEYWORDS: Structured optical fibers, Femtosecond phenomena, Fiber Bragg gratings, Reflectivity, Cladding, Photonic crystal fibers, Nonlinear optics, Modulation, Laser damage threshold, Refractive index, Step index fibers

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Proceedings Article | 16 March 2015 Paper

The role of highly non-linear index change mechanism during femtosecond grating writing in microstructured optical fibers

Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9359, 93590J (2015) https://doi.org/10.1117/12.2081953

KEYWORDS: Micro optical fluidics, Refractive index, Femtosecond phenomena, Absorption, Cladding, Fiber Bragg gratings, Silica, Structured optical fibers, Modulation, Step index fibers

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Proceedings Article | 16 March 2015 Paper

Opportunities for designing microstructured optical fibers for efficient femtosecond laser grating inscription

Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9359, 93590I (2015) https://doi.org/10.1117/12.2081937

KEYWORDS: Micro optical fluidics, Cladding, Femtosecond phenomena, Fiber Bragg gratings, Optical design, Refractive index, Structured optical fibers, Absorption, Beam propagation method, Data modeling

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Proceedings Article | 17 September 2014 Paper

Internal strain monitoring in composite materials with embedded photonic crystal fiber Bragg gratings

Thomas Geernaert, Sanne Sulejmani, Camille Sonnenfeld, Karima Chah, Geert Luyckx, Nicolas Lammens, Eli Voet, Martin Becker, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9226, 92260D (2014) https://doi.org/10.1117/12.2061608

KEYWORDS: Sensors, Composites, Fiber Bragg gratings, Photonic crystal fibers, Structural health monitoring, Adhesives, Temperature metrology, Finite element methods, Fiber optics sensors, Optical fibers

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Proceedings Article | 2 June 2014 Paper

Microstructured optical fiber Bragg grating-based shear stress sensing in adhesive bonds

Sanne Sulejmani, Camille Sonnenfeld, Thomas Geernaert, Geert Luyckx, Danny Van Hemelrijck, Pawel Mergo, Krzysztof Skorupski, Waclaw Urbanczyk, Karima Chah, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9157, 91577P (2014) https://doi.org/10.1117/12.2059076

KEYWORDS: Sensors, Adhesives, Fiber Bragg gratings, Structured optical fibers, Finite element methods, Structural health monitoring, Birefringence, Mechanical sensors, Cladding, Micro optical fluidics

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Proceedings Article | 2 June 2014 Paper

Microstructured optical fiber Bragg grating-based strain and temperature sensing in the concrete buffer of the Belgian supercontainer concept

Thomas Geernaert, Sanne Sulejmani, Camille Sonnenfeld, Geert Luyckx, Karima Chah, Lou Areias, Pawel Mergo, Waclaw Urbanczyk, Philippe Van Marcke, Erik Coppens, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9157, 915777 (2014) https://doi.org/10.1117/12.2059369

KEYWORDS: Sensors, Structured optical fibers, Fiber Bragg gratings, Temperature metrology, Fiber optics sensors, Composites, Micro optical fluidics, Optical fibers, Carbon, Optical testing

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Proceedings Article | 2 June 2014 Paper

Signal-to-noise ratio evaluation with draw tower fibre Bragg gratings (DTGs) for dynamic strain sensing at elevated temperatures and corrosive environment

B. De Pauw, A. Lamberti, S. Vanlanduit, K. Van Tichelen, T. Geernaert, F. Berghmans

Proceedings Volume 9157, 91577D (2014) https://doi.org/10.1117/12.2059504

KEYWORDS: Signal to noise ratio, Sensors, Fiber Bragg gratings, Adhesives, Environmental sensing, Liquids, Optical coatings, Detection and tracking algorithms, Metals, Integrated optics

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Proceedings Article | 15 May 2014 Paper

On a possible method to measure the radial profile of the photoelastic constant in step-index optical fiber

Sophie Acheroy, Patrick Merken, Thomas Geernaert, Heidi Ottevaere, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9141, 914115 (2014) https://doi.org/10.1117/12.2050343

KEYWORDS: Photoelasticity, Optical fibers, Refractive index, Glasses, Silica, Multimode fibers, Cladding, Microscopes, Birefringence, Structured optical fibers

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Proceedings Article | 15 May 2014 Paper

Reflective polarimetric vibration sensor based on temperature-independent FBG in HiBi microstructured optical fiber

Karima Chah, Christophe Caucheteur, Patrice Mégret, Sanne Sulejmani, Thomas Geernaert, Hugo Thienpont, Francis Berghmans, Marc Wuilpart

Proceedings Volume 9141, 91410U (2014) https://doi.org/10.1117/12.2054201

KEYWORDS: Sensors, Fiber Bragg gratings, Micro optical fluidics, Birefringence, Polarimetry, Reflectivity, Structured optical fibers, Temperature metrology, Polarization, Transducers

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Fiber optic sensors outperform traditional sensor technologies in fields such as structural health monitoring, vibration and seismic activity monitoring, intrusion detection, and many other applications. Their key advantages include electromagnetic interference immunity, lightweight, small size, multiplexing capabilities, low power consumption, corrosion and high temperature resistance. To meet the demand of more and more challenging optical sensors a new generation of optical fibers, the so-called microstructured optical fibers (MOFs), has appeared. These fibers are composed of a structure of holes surrounding a solid core, which offers a unique design flexibility to optimize their waveguide properties for specific applications. In particular, the design can be optimized to strongly reduce the cross-sensitivity of a sensor to parasitic physical parameters like temperature variations, as is the case for the sensor presented here. Our sensor is based on a Bragg grating inside a temperature independent highly birefringent MOF with a high transverse strain sensitivity, to evaluate vibrations by a polarimetric measurement of the reflection spectrum. This technique takes advantage of the stress-induced phase shift between the two orthogonally polarized fiber eigenmodes. It consists in coupling linearly polarized light through one arm of an optical coupler (50:50) in the sensing optical fiber in which a highly reflective fiber Bragg grating is inscribed. The reflected signal is analysed through a linear polarizer. The optical fiber is crushed by a mechanical transducer designed to transform the vibration into a mechanical stress transversal to the fiber’s axis. The vibration therefore induces a change of the phase modal birefringence that varies in time at the vibration frequency. In this study we show that using standard single-mode fibers to realize the sensor do not provide stable measurements and that using conventional polarization-maintaining fibers lead to a significant cross-sensitivity to temperature. We then show that the use of a specific type of highly birefringent microstructured optical fiber allows temperature independent (up to 120°C) and repeatable vibration measurements.

Proceedings Article | 2 May 2014 Paper

Photonic crystal lenses for transverse focusing of laser illumination in microstructured optical fibers

Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9128, 91280J (2014) https://doi.org/10.1117/12.2053870

KEYWORDS: Micro optical fluidics, Cladding, Photonic crystals, Structured optical fibers, Femtosecond phenomena, Lenses, Refractive index, Polarization, Manufacturing, Photonic crystal fibers

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Proceedings Article | 2 May 2014 Paper

Fiber Bragg grating-based shear strain sensors for adhesive bond monitoring

Sanne Sulejmani, Camille Sonnenfeld, Thomas Geernaert, Danny Van Hemelrijck, Geert Luyckx, Pawel Mergo, Waclaw Urbanczyk, Karima Chah, Christophe Caucheteur, Patrice Mégret, Hugo Thienpont, Francis Berghmans

Proceedings Volume 9128, 91280D (2014) https://doi.org/10.1117/12.2050338

KEYWORDS: Sensors, Adhesives, Fiber Bragg gratings, Structured optical fibers, Structural health monitoring, Thermal sensing, Micro optical fluidics, Optical fibers, Fiber optics sensors, Mechanical sensors

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Proceedings Article | 3 May 2013 Paper

Embedded fiber Bragg gratings in photonic crystal fiber for cure cycle monitoring of carbon fiber-reinforced polymer materials

C. Sonnenfeld, G. Luyckx, F. Collombet, Y.-H. Grunevald, B. Douchin, L. Crouzeix, M. Torres, T. Geernaert, S. Sulejmani, S. Eve, M. Gomina, K. Chah, P. Mergo, H. Thienpont, F. Berghmans

Proceedings Volume 8775, 87750O (2013) https://doi.org/10.1117/12.2020900

KEYWORDS: Composites, Fiber Bragg gratings, Sensors, Temperature metrology, Carbon, Birefringence, Calibration, Photonic crystal fibers, Fiber reinforced polymers, Optical fibers

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Proceedings Article | 18 December 2012 Paper

Applying optical design methods to the development of application specific photonic crystal fibres

Francis Berghmans, Thomas Geernaert, Marek Napierała, Tigran Baghdasaryan, Camille Sonnenfeld, Sanne Sulejmani, Tomasz Nasiłowski, Paweł Mergo, Tadeusz Martynkien, Wacław Urbańczyk, Elżbieta Bereś-Pawlik, Hugo Thienpont

Proceedings Volume 8550, 85500B (2012) https://doi.org/10.1117/12.999353

KEYWORDS: Refractive index, Cladding, Fiber Bragg gratings, Birefringence, Silica, Structured optical fibers, Photonic crystal fibers, Fiber lasers, Femtosecond phenomena, Absorption

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Proceedings Article | 17 October 2012 Paper

Rocking filter in microstructured fiber for high resolution hydrostatic pressure measurements

A. Anuszkiewicz, G. Statkiewicz-Barabach, T. Borsukowski, J. Olszewski, T. Martynkien, D. Kowal, W. Urbanczyk, P. Mergo, M. Makara, K. Poturaj, T. Geernaert, F. Berghmans, H. Thienpont

Proceedings Volume 8421, 84210W (2012) https://doi.org/10.1117/12.968627

KEYWORDS: Optical filters, Temperature metrology, Polarimetry, Birefringence, Fiber Bragg gratings, Cladding, Polarization, Carbon dioxide lasers, Optical fibers, Sensors

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Proceedings Article | 26 April 2012 Paper

Mechanical reliability of microstructured optical fibers: a comparative study of tensile and bending strength

C. Sonnenfeld, S. Sulejmani, T. Geernaert, S. Eve, M. Gomina, M. Makara, K. Skorupski, P. Mergo, F. Berghmans, H. Thienpont

Proceedings Volume 8426, 84260Q (2012) https://doi.org/10.1117/12.923184

KEYWORDS: Optical fibers, Micro optical fluidics, Failure analysis, Silica, Structured optical fibers, Scanning electron microscopy, Coating, Reliability, Glasses, Cladding

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Proceedings Article | 26 April 2012 Paper

Microstructure-assisted grating inscription in photonic crystal fibers

Tigran Baghdasaryan, Thomas Geernaert, Francis Berghmans, Hugo Thienpont

Proceedings Volume 8426, 842606 (2012) https://doi.org/10.1117/12.923335

KEYWORDS: Photonic crystals, Cladding, Photonic crystal fibers, Refractive index, Femtosecond phenomena, Fiber Bragg gratings, Silica, Absorption, Glasses, GRIN lenses

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Proceedings Article | 26 April 2012 Paper

On the influence of hexagonal lattice photonic crystal fiber parameters on femtosecond grating inscription

Tigran Baghdasaryan, Thomas Geernaert, Francis Berghmans, Hugo Thienpont

Proceedings Volume 8426, 84260W (2012) https://doi.org/10.1117/12.923334

KEYWORDS: Cladding, Femtosecond phenomena, Refractive index, Absorption, Ultraviolet radiation, Photonic crystal fibers, Fiber Bragg gratings, Optical simulations, Finite-difference time-domain method, Silica

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Proceedings Article | 29 November 2011 Paper

Photonic crystal fibre Bragg grating based sensors: opportunities for applications in healthcare

Francis Berghmans, Thomas Geernaert, Sanne Sulejmani, Hugo Thienpont, Geert Van Steenberge, Bram Van Hoe, Peter Dubruel, Waclaw Urbanczyk, Pawel Mergo, David Webb, Kyriacos Kalli, Jan Van Roosbroeck, Kate Sugden

Proceedings Volume 8311, 831102 (2011) https://doi.org/10.1117/12.901240

KEYWORDS: Sensors, Fiber Bragg gratings, Polymers, Phase only filters, Optical fibers, Polymeric sensors, Silica, Fiber optics sensors, Photonic crystal fibers, Medicine

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Proceedings Article | 14 May 2010 Paper

UV Bragg grating inscription in germanium-doped photonic crystal fibers

Thomas Geernaert, Martin Becker, Pawel Mergo, Tomasz Nasilowski, Jan Wojcik, Waclaw Urbanczyk, Manfred Rothhardt, Christoph Chojetzki, Hartmut Bartelt, Francis Berghmans, Hugo Thienpont

Proceedings Volume 7714, 77140S (2010) https://doi.org/10.1117/12.855763

KEYWORDS: Fiber Bragg gratings, Doping, Ultraviolet radiation, Photonic crystal fibers, Refractive index, Modulation, Germanium, Step index fibers, Specialty optical fibers, Fiber optics sensors

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Proceedings Article | 14 May 2010 Paper

Optical fiber sensors embedded in flexible polymer foils

Bram Van Hoe, Geert Van Steenberge, Erwin Bosman, Jeroen Missinne, Thomas Geernaert, Francis Berghmans, David Webb, Peter Van Daele

Proceedings Volume 7726, 772603 (2010) https://doi.org/10.1117/12.854865

KEYWORDS: Fiber Bragg gratings, Sensors, Skin, Fiber optics sensors, Polymers, Optical fibers, Polymer optical fibers, Phase only filters, Optical sensors, Silica

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Proceedings Article | 5 October 2009 Paper

Benchmarking the response of Bragg gratings written in micro-structured and bow tie fiber embedded in composites

G. Luyckx, E. Voet, T. Geernaert, K. Chah, T. Nasilowski, W. De Waele, M. Becker, H. Bartelt, W. Urbanczyk, J. Wojcik, J. Degrieck, F. Berghmans, H. Thienpont

Proceedings Volume 7503, 75035P (2009) https://doi.org/10.1117/12.834831

KEYWORDS: Fiber Bragg gratings, Structured optical fibers, Micro optical fluidics, Composites, Optical fibers, Birefringence, Temperature metrology, Carbon, Sensors, Epoxies

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Proceedings Article | 5 October 2009 Paper

Point-by-point Bragg grating inscription in single-mode microstructure fibre using NIR femtosecond laser

K. Kalli, T. Geernaert, C. Koutsides, M. Komodromos, T. Nasilowski, W. Urbanczyk, J. Wojcik, F. Berghmans, H. Thienpont

Proceedings Volume 7503, 75037O (2009) https://doi.org/10.1117/12.835339

KEYWORDS: Fiber Bragg gratings, Femtosecond phenomena, Micro optical fluidics, Optical fibers, Near infrared, Microscopes, Pulsed laser operation, Laser systems engineering, Temperature metrology, Diffraction

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Proceedings Article | 20 May 2009 Paper

Fiber Bragg gratings in microstructured optical fibers for stress monitoring

Thomas Geernaert, Geert Luyckx, Eli Voet, Tomasz Nasilowski, Karima Chah, Martin Becker, Hartmut Bartelt, Waclaw Urbanczyk, Jan Wójcik, Wim De Waele, Joris Degrieck, Francis Berghmans, Hugo Thienpont

Proceedings Volume 7357, 73570I (2009) https://doi.org/10.1117/12.820441

KEYWORDS: Fiber Bragg gratings, Micro optical fluidics, Composites, Birefringence, Sensors, Structured optical fibers, Optical fibers, Fiber optics sensors, Silica, Refractive index

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Proceedings Article | 21 April 2008 Paper

The fabrication and characterization of fiber Bragg gratings in highly birefringent photonic crystal fibers for sensing applications

Thomas Geernaert, Tomasz Nasilowski, Karima Chah, Martin Becker, Manfred Rothhardt, Marcin Szpulak, Jacek Olszewski, Krzysztof Poturaj, Jan Wójcik, Waclaw Urbanczyk, Herman Terryn, Hartmut Bartelt, Francis Berghmans, Hugo Thienpont

Proceedings Volume 6990, 69900C (2008) https://doi.org/10.1117/12.781651

KEYWORDS: Fiber Bragg gratings, Birefringence, Sensors, Photonic crystal fibers, Single mode fibers, Multiplexing, Annealing, Step index fibers, Polarization, Excimer lasers

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