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Your search keyword '"J.-P. Wallerand"' showing total 2 results
Start Over Author "J.-P. Wallerand" Publisher elsevier bv
2 results on '"J.-P. Wallerand"'

1. Absolute multilateration-based coordinate measurement system using retroreflecting glass spheres

Author

D. Truong, Joffray Guillory, J.-P. Wallerand, Christophe Alexandre, Laboratoire commun de métrologie LNE-CNAM (LCM), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Centre d'études et de recherche en informatique et communications (CEDRIC), and Ecole Nationale Supérieure d'Informatique pour l'Industrie et l'Entreprise (ENSIIE)-Conservatoire National des Arts et Métiers [CNAM] (CNAM)

Subjects
Materials science, Aperture, business.industry, System of measurement, 010401 analytical chemistry, General Engineering, Gimbal, retroreflecting glass spheres, Multilateration, 01 natural sciences, coordinate measurement system, Collimated light, Standard deviation, 0104 chemical sciences, 010309 optics, [SPI]Engineering Sciences [physics], Optics, Position (vector), Large Volume Metrology, 0103 physical sciences, Absolute Distance Metre, SPHERES, business, multilateration technique with self-calibration
Abstract

International audience; We have measured the three-dimensional coordinates of retroreflecting glass spheres using a multilateration technique. To this end, the distances between each target and our measurement heads have been determined by an in-house prototype of electro-optical absolute distance meter. The used targets are spheres of glass refractive index n=2 and of diameter 14.2 mm. They offer a much larger aperture than corner cubes and a lower cost, but they present a low reflectivity. However, this paper shows that with a proper collimation of the laser beams it is possible to reach a range of operation of 20 m. The standard uncertainty on such distances is better than 11 µm, including the mechanical errors of the gimbal mechanisms of our aiming systems. This uncertainty has been validated thanks to a comparison with an interferometric bench. In addition, the measurement of the coordinates of 16 glass spheres using a self-calibration multilateration algorithm has also confirmed the performances of the developed system: the standard deviation on the position errors has been estimated to about 10 µm.

Published
2022
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2. CW frequency doubling of 1029nm radiation using single pass bulk and waveguide PPLN crystals

Author

Jan Hrabina, Y. Candela, J.-P. Wallerand, F. du Burck, O. Acef, N. Chiodo, Laboratoire national de métrologie et d'essais - Systèmes de Référence Temps-Espace (LNE - SYRTE), Systèmes de Référence Temps Espace (SYRTE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB (Lhomond)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Waveguide (electromagnetism), Materials science, Lithium niobate, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, law.invention, 010309 optics, Crystal, chemistry.chemical_compound, Optics, law, 0103 physical sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], 010302 applied physics, business.industry, Energy conversion efficiency, Single-mode optical fiber, Second-harmonic generation, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, chemistry, Continuous wave, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], business, Physics - Optics, Optics (physics.optics)
Abstract

Following various works on second harmonic process using periodically poled Lithium Niobate crystals (PPLN), we report on the performances comparison between commercial bulk and proton-exchanged waveguide crystals operating at 1029 nm. We use a continuous wave (CW) amplified Yb doped single fiber laser delivering up to 500 mW in single mode regime. In case of bulk crystal we generate 4 mW using 400 mW IR power. The use of waveguide crystal leads to an increase of the harmonic power up to 33 mW with input IR power limited to 200 mW. Nevertheless, this impressive efficiency was affected by the long term degradation of the non-linear waveguide crystal. A decrease of about 40% of the conversion efficiency was observed after 2 years of use, neither associated to the degradation of the coupling efficiency nor to that of the AR coating. This behavior could be attributed to a slow diffusion of protons in the guide.

Published
2013
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