Abstract:
The manufacture of glass films on substrates involves the flame reaction of an aerosol comprised of droplets of a solution containing all the precursors for the glass. A solution containing the precursors for all oxide components is atomized, and the resulting droplets are reacted in a flame to form spherical glass particles which are deposited on a heated substrate. By moving the substrate through the flame, a homogeneous deposit is achieved. Subsequent heat treatment in a furnace sinters the porous particle layer into a clear glass. The method has been successfully employed for the formation of sodium borosilicate glass films on silicon substrates and rare earth-doped multicomponent glass films for active devices.
Abstract:
PURPOSE: A method for producing preform for optical fiber doped with rare earth material is provided to accomplish high-efficient energy conversion, to control concentration of rare earth element and proper codopant independent on each other and to set combination of high level dopant to increase the energy conversion efficiency. CONSTITUTION: The method is to prepare preform of optical fiber doped with rare earth material by several steps comprising vaporization depositing porous silica soot layer onto surface of inner side of silica based substrate tube; making precipitation of the soot layer into a saturated solution containing at least one rare earth element and codopant element; drying the precipitated soot layer from the solution with stream of chlorine and inert gas; oxidizing the rare earth and codopant elements at the oxidation temperature to obtain oxides of both elements; and reclaiming the soot layer with glass layer.
Abstract:
La fibre comprend un cœur (2) d'indice N et de diamètre 10 µm ou plus, entouré par un anneau (4) d'indice N+Δn et d'épaisseur ΔR, et une gaine (6) entourant l'anneau et comportant par exemple des trous d'air (8). Selon l'invention : Δn ≥ 10 -3 et ΔR = α/(Δn) β [1] avec : 5x10 -4 µm≤α≤5x10 -2 µm et 0,5≤β≤1,5. Les nombres α et β dépendent de la longueur d'onde λ de la lumière guidée par la fibre, du nombre de trous manquants dans celle-ci, du diamètre d des trous, de leur espacement Λ et de N. Pour concevoir la fibre, on choisit λ, le nombre de trous manquants, d/Λ, le taux de dopage du cœur, Λ et Δn; et l'on détermine ΔR par la relation [1] de façon à obtenir un mode fondamental aplati.
Abstract:
Hollow ingots of transparent synthetic vitreous silica glass of external diameter greater than 400 mm and internal diameter greater than 300 mm are disclosed. The ingots are substantially free from bubbles or inclusions greater than 100 μιη in diameter, have no more than 100 ppB of any individual metallic impurity, and have chlorine concentration less than 5 ppM. Also disclosed are methods for producing such ingots, in which a porous soot body of density greater than 0.4 g/ cm 3 is deposited on an oxidation resistant mandrel. The soot body is dehydrated on a mandrel comprising graphite, carbon fibre reinforced carbon, silicon carbide, silicon impregnated silicon carbide, silicon carbide-coated graphite or vitreous silica, either under vacuum or in the presence of a reducing gas, and then sintered to transparent pore-free glass under vacuum or in an atmosphere of helium.
Abstract:
An optical fiber (10), comprising: (i) a rare earth doped silica based elongated core (12) with a first refractive index (n1 with an aspect ratio of 1.5 to 10; (ii) a silica based moat (13) abutting and at least substantially surrounding the core, the moat having a refractive index n2, wherein n21; (iii) a silica based inner cladding (14) surrounding the moat, the inner cladding having a third refractive index (n3), wherein n1>n3; and n3>n2; (iv) a silica based outer cladding (16) surrounding said inner cladding, the outer cladding having a fourth refractive index (n4), such that n43; the optical fiber exhibits single polarization at the operating wavelength band.
Abstract:
A method of fabricating doped quartz component is provided herein. In one embodiment, the doped quartz component is a yttrium doped quartz ring configured to support a substrate. In another embodiment, the doped quartz component is a yttrium and aluminum doped cover ring. In yet another embodiment, the doped quartz component is a yttrium, aluminum and nitrogen containing cover ring.
Abstract:
A process for the preparation of a micro- or nano-sized product comprises preparing a sol, introducing the sol onto a substrate matrix before the gelation point of the sol has been reached, and applying a vacuum. The products of the process have a. diameter of from 1 to 10 micrometers and a controlled length of up to several millimetres, They can be used in detectors of sub-micron objects, including biological pathogens, integrated optics, cavity quantum electrodynamics, nonlinear optics and optical communications, temperature detectors, bio- and chemosensors, microchannels for optically and spectral controlled cell growth, optical mode converters, optical polarization converters, components for microelectrophoresis, light emitters, optical amplifiers and optical elements of quantum cryptographic systems.
Abstract:
The invention relates to a method for doping material, the method being characterized by depositing at least one dopant deposition layer or a part thereof on the surface of the material and/or on a surface of a part or parts thereof with the atom layer deposition (ALD) method, and further processing the material coated with a dopant in such a manner that the original structure of the dopant layer is changed to obtain new properties for the doped material. The material to be doped is preferably glass, ceramic, polymer, metal, or a composite material made thereof, and the further processing of the material coated with the dopant is a mechanical, chemical, radiation, or heat treatment, whereby the aim is to change the refraction index, absorbing power, electrical and/or heat conductivity, colour, or mechanical or chemical durability of the doped material.