Abstract:
An optically active phosphorus-silicate glass when pumped to directly excite Er ions provides gain in 1565nm to 1620nm range and comprises in weight percent: SiO2 50 to 92%; Er2O3 0.01 to 2%; P2O5 greater than 5%; and Al2O3 0.0 to 0.3%.
Abstract:
A light amplifying optical fiber capable of restricting a reduction in amplifying efficiency and non-linearity caused by the concentration quenching of erbium ions. At least one of rare earth elements, having an ion radius at least 70% and up to 130% of that of erbium and excluding erbium, for example, Yb, is added to the core portion of an erbium-ion-added light amplifying optical fiber.
Abstract:
An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5.
Abstract:
An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5.
Abstract:
An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5.
Abstract:
Verfahren zur Herstellung eines gesinterten Siliciumdioxid enthaltenden Granulates mit einer BET-Oberfläche von weniger als 1 m 2 /g und einem Anteil an Verunreinigungen von weniger als 50 ppm, bei dem man ein Gemisch, welches Siliciumdioxidpulver und eine Metallverbindung enthält, in einer Atmosphäre mit einer relativen Luftfeuchte von 10 bis 100%, bei Temperaturen von 0 bis 50°C intensiv mittels eines Dispergieraggregates vermengt, die krümelige Masse in Stücke zerteilt, nachfolgend trocknet, reinigt und sintert. Die Feuchte des Siliciumdioxidpulvers und/oder die Luftfeuchte reicht wenigstens aus, um die Metallverbindung vollständig zu hydrolysieren.
Abstract:
An improved sol-gel process is disclosed for the making of large synthetic silica based bioactive materials objects crack-free. A series of ordered mesoporous SiO 2 -CaO-P 2 O 5 sol-gel glasses which are highly bioactive has been synthesized through a sol-gel process. The mesoporous glasses are highly bioactive compared with conventional ones, due to the increased textural characteristics i.e. surface area. The bioactivity tests point out that the surface area, porosity, and 3D-structure become more important than chemical composition during the apatite crystallization stage in these materials, due to the very high textural parameters obtained. The product is intended to be used for tissue engineering applications.
Abstract:
La présente invention concerne un guide optique (100) comportant un milieu amplificateur comprenant :
un coeur (10) en une matrice principale d'un matériau transparent, la matrice principale contenant des particules (1, 2), chaque particule étant formée d'une matrice submicronique distincte de la matrice principale et dopée par un élément actif métallique, une gaine guidante externe (11) en contact avec le coeur (10). La taille des particules (1, 2) est inférieure à 20 nm. La présente invention concerne aussi un procédé de fabrication d'un tel guide.
Abstract:
A method for controlling the refractive index achieved using a fluorine dopant gas, wherein CF4 is employed as the dopant gas, and the soot preform (12) is doped using the CF4 for a time and temperature sufficient to result in a decrease in fluorine dopant nearest the surface which is in contact with the CF4 gas. Preform (12) is mounted on handle (11) which is fused to handle (14) and the assembly (20) is heated in a furnace muffle (15). The CF4 flows through furnace muffle (15), as indicated by arrows (17), and preferably contains a diluent gas such as helium. An optional centerflow gas (16) may be flowed through the centerline hole (18) in several embodiments, which consists of helium. The end of the porous preform (12) may optionally include a capillary tube (19) to prevent the muffle gases (17) from entering the preform.