Femtosecond-laser-induced highly birefringent Bragg gratings in standard optical fiber

Chah, Karima; Kinet, Damien; Wuilpart, Marc; Mégret, Patrice; Caucheteur, Christophe

doi:10.1364/ol.38.000594

Cited by 65 publications

(33 citation statements)

References 17 publications

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“…The adherends have a thickness of 3 mm and length of 100 mm, and the width of the sample is 25 mm. The FBG sensors were inscribed using UV femtosecond laser and phase mask technique, with a similar laser configuration as described in [48]. The UV output power was fixed to 200 mW and focused to the core of the optical fiber with a cylindrical lens of 50 mm focal length.…”

Section: Experimental and Fem Modeling Resultsmentioning

confidence: 99%

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Sulejmani¹,

Sonnenfeld²,

Geernaert³

et al. 2013

Opt. Express

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Abstract:We demonstrate shear stress sensing with a Bragg grating-based microstructured optical fiber sensor embedded in a single lap adhesive joint. We achieved an unprecedented shear stress sensitivity of 59.8 pm/MPa when the joint is loaded in tension. This corresponds to a shear strain sensitivity of 0.01 pm/µε. We verified these results with 2D and 3D finite element modeling. A comparative FEM study with conventional highly birefringent side-hole and bow-tie fibers shows that our dedicated fiber design yields a fourfold sensitivity improvement.

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Section: Experimental and Fem Modeling Resultsmentioning

confidence: 99%

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Sulejmani¹,

Sonnenfeld²,

Geernaert³

et al. 2013

Opt. Express

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“…5. It is similar to those used in [32,33]. Two stepindex POFs with and without grating, respectively, were placed parallel and pressed between two 20 mm long metal plates, which avoided the tilt of the loading area.…”

Section: Transverse Force Measurement With Step-index Pofbgsmentioning

confidence: 99%

Polarization effects in polymer FBGs: study and use for transverse force sensing

Sáez-Rodríguez²,

Bang

et al. 2015

Opt. Express

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Bragg gratings photo-inscribed in polymer optical fibers (POFs) are more sensitive to temperature and pressure than their silica counterparts, because of their larger thermo-optic coefficient and smaller Young's modulus. Polymer optical fiber Bragg gratings (POFBGs) are most often photo-written in poly(methylmethacrylate) (PMMA) based materials using a continuous-wave 325 nm HeCd laser. In this work, we present the first study about birefringence effects in POFBGs manufactured in different types of fiber. To achieve this, highly reflective (> 90%) gratings were produced with the phase mask technique. Their spectral response was then monitored in transmission with polarized light. Polarization dependent loss (PDL) and differential group delay (DGD) were computed from the Jones matrix eigenanalysis using an optical vector analyzer. Maximum values exceeding several dB and a few picoseconds were obtained for the PDL and DGD, respectively. An inverse scattering technique applied to the experimental data provided an estimate of the photo-induced birefringence value arising from the side fabrication process. The response to lateral force was finally investigated for various incident directions using the PDL response of FBGs manufactured in step-index POFs. As the force induced birefringence adds to the photo-induced one, a force dependent evolution of the PDL maximum value was noticed, with a good temperatureinsensitivity.

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“…Spectra-Physics amplifier of 120 fs duration and 1 kHz repetition rate. The femtosecond inscription setup described in 8,10 and the PbP technique were implemented. The beam was tightly focused in the fibre core using a long working distance microscope objective (0.65 numerical aperture) without oil immersion.…”

Section: Eccentric Fbgs Inscriptionmentioning

confidence: 99%

Metal-coated second-order fibre Bragg gratings produced by infrared femtosecond radiation for dual temperature and strain sensing

2016

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We report highly localized second-order fibre Bragg gratings at 1585 nm inscribed by point-by-point focused infrared femtosecond pulses. A thin gold coating deposited on the fibre outer surface at the grating location allows shielding the cladding mode resonances from the outer medium, so that they remain present in the transmitted amplitude spectrum. The Bragg resonance of the second-order grating is surrounded by high-order cladding mode resonances of the firstorder grating. These cladding modes exhibit the same temperature sensitivity as the Bragg resonance (10.6 pm/°C) but high differential strain sensitivity (-0.55 pm/µε versus 1.20 pm/µε for the Bragg mode). Therefore, the conditioning of the matrix inversion as demodulation method is fully satisfied, yielding a new design of fibre sensor able to discriminate between temperature and strain, with an unprecedented sensitivity.Keywords: localized fibre Bragg grating, femtosecond IR inscription technique, strain and temperature sensitivities, temperature and strain sensor, temperature and strain discrimination method.

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Femtosecond-laser-induced highly birefringent Bragg gratings in standard optical fiber

Cited by 65 publications

References 17 publications

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Polarization effects in polymer FBGs: study and use for transverse force sensing

Metal-coated second-order fibre Bragg gratings produced by infrared femtosecond radiation for dual temperature and strain sensing

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