Photo-darkening
Steady photo-darkening of thulium alumino-silicate fibers pumped at 1.07 µm: Quantitative effect of lanthanum, cerium and thulium.
... interesting because it offers many potential optical transi- tions spanning from 0.45 to 1.9 µm. Except for the cur- rent pumping scheme at 0.79 µm which provides efficient amplification around 1.9 µm through a ...
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Photo-darkening In Thulium-Doped Alumino-Silicate Fibres Pumped At 1.07 µm: Effect of Co-Doping with Lanthanum or Cerium
... Rare-earth (RE) doped fibre lasers and amplifiers based on silica offer the best performances in terms of combined efficiency, power and beam quality. Silica glass had indeed chemical, mechanical and economic advantages ...
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Impact of cerium and lanthanum on the photo-darkening and photo-bleaching mechanisms in thulium-doped fibre
... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ...
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Photo-and radio-darkening in rare-earth-doped silica-based optical fibers
... and photo- radio-darkening (PRD) followed by photo-bleaching ...same Photo-Darkening Equilibrium Level (PDEL), uniquely dependent on the pump power, is shown to be reached either from a ...
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Simultaneous effects of photo-and radio-darkening in ytterbium-doped aluminosilicate fibres
... INTRODUCTION Ytterbium-doped silica optical fibres (YDF) may suffer from twofold degradation when operated in amplifying conditions and harsh environments. Excess optical losses are induced by external ionizing ...
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The interplay between photo-and radiation-induced darkening in ytterbium-doped fibres
... (radiation-induced darkening or RD), but also due to the pump (photo-darkening, ...simultaneous photo-radiation-induced darkening (PRD) as a function of pump power, total ionizing dose ...
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Simultaneous effects of photo- and radio- darkening in ytterbium-doped aluminosilicate fibers
... two darkening processes when used under pumping in radiative ...(radio- darkening or RD), but also, possibly, due to the pump itself (photo-darkening, ...simultaneous photo-radio- ...
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A sufficient model of the photo-, radio-, and simultaneous photo-radio-induced degradation of ytterbium-doped silica optical fibres
... of photo-, radio-, and simultaneous photo-radio-darkening of Yb-doped silica optical ...on photo-darkening and with all of the experiments reported in the Duchez’s ...
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Mécanismes de photo-commutation réversible des protéines fluorescentes
... the photo-induced protonation at 100 K is a common process for eYFP, Dronpa and ...opposite photo-switching behavior of these fluorescent proteins at low temperature and at room temperature, we deduce that ...
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Modélisation de Processus Photo induits du Photosystem II
... specific photo- physics can be related to unambiguous energetic, electronic, and structural features through the use of advanced spectroscopic methods, and this may yield important insights into many aspects of ...
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The limb darkening of alpha Cen B: Matching 3D hydrodynamical models with interferometric measurements
... In Sect. 2, we report the new interferometric measure- ments of α Cen B obtained since 2003 using the VINCI instrument. Sect. 3 describes our 3D simulations to derive self-consistent stellar limb darkening of α ...
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Assessment method for photo-induced waveguides
... In this paper we propose a simple method to assess the properties of photo-induced waveguides. The method relies on the spatio-temporal analysis of light distribution at the exit face of a waveguide while its ...
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Illumination photo-réaliste interactive en environnement distant
... Illumination photo-réaliste interactive en environnement distant ...ILLUMINATION PHOTO-RÉALISTE INTERACTIVE EN ENVIRONNEMENT DISTANT Abstract : In the frame of an augmented reality project we propose to ...
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Dégradation du Triphénylméthane par les procédés Fenton et Photo-Fenton
... Résumé : La production des colorant et leur utilisation génère des effluents persistants, bio réfractaires, non biodégradables, fortement colorés, toxiques, cancérogènes, mutagènes. Les techniques traditionnelles du ...
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Modélisation cinétique de la photo-thermo-oxydation du polypropylène
... Ensuite, les premiers chapitres de résultats regrouperont les travaux portant sur la thermooxydation qui constitue le cœur du modèle et un sous-groupe du modèle photo- thermique puisque la température est une ...
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The limb darkening of alpha Cen B: Matching 3D hydrodynamical models with interferometric measurements
... 1. Introduction Limb-darkening (hereafter LD) is a well-known effect in stel- lar physics. Its manifestation is a non-uniform brightness of the disk, whose edges appear fainter than the center. This effect oc- curs ...
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Coherent intrinsic images from photo collections
... 7 Conclusion We introduced a method to compute coherent intrinsic image de- compositions from photo collections. Such collections contain mul- tiple lighting conditions and can be used to automatically calibrate ...
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Photo-switching of organic monolayers on silicon surfaces
... Schematic photo isomerization process for azobenzene taken from [ 12 ] Other photochromic molecules are often switched from one form to the other by the rotation around a double bond or by a ring opening and ring ...
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thermo-oxydation et photo-oxydation au cur du procede elipse
... cette photo-oxydation ayant lieu dans la colonne d'eau pourrait être utilisée pour optimiser la destruction de la matière organique résiduelle en solution ...
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Generated suspect photo board using artificial intelligence
... 1.2 The Problem addressed in this work Figure 1 - Photo board as shown to the witnesses When interrogating the witness, the police presents a photo board of 9 suspects as shown in Figure 1. Some of the ...
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