Abstract:
A method for manufacturing a photomask material includes delivering a powder containing silicon dioxide into a plasma to produce silica particles and depositing the silica particles on a deposition surface to form glass.
Abstract:
High index-contrast fiber waveguides, materials for forming high index-contrast fiber waveguides, and applications of high index-contrast fiber waveguides are disclosed.
Abstract:
A method for manufacturing optical fiber preform comprising a core glass containing a light emitting substance (e.g. rare earth metal dopant) and a cladding glass, easily controlling an amount of the light emitting substance incorporated into the core glass without requiring any complicated step, includes the steps of forming a porous layer made of a precursor of the core glass on an inner surface of a hollow tube having an inner surface made of the cladding glass, spraying a medium containing the light emitting substance onto the porous layer, forming a layer of the core glass containing the light emitting substance by sintering the porous layer containing the light emitting substance, and forming a preform rod by collapsing the obtained hollow tube into a solid article. Alternatively, another method according to the invention includes the steps of spraying a medium containing a precursor of the core glass on the inner surface of the hollow tube, forming the core glass layer by sintering the formed precursor layer, and forming a preform rod by collapsing the obtained hollow tube into a solid article. A third method comprises spraying sequentially core-forming material and light emitting substance and a fourth method simultaneous spraying of both. An optical fiber can be formed by drawing the thus obtained optical fiber preforms.
Abstract:
This invention relates to the production of high purity fused silica glass through oxidation and/or flame hydrolysis of a halide-free, organosilicon-R compound in vapor form having the following properties:
(a) producing a gas stream of a halide-free silicon-containing compound in vapor form capable of being converted through thermal decomposition with oxidation or flame hydrolysis to SiO₂; (b) passing said gas stream into the flame of a combustion burner to form amorphous particles of fused SiO₂; (c) depositing said amorphous particles onto a support; and (d) either essentially simultaneously with said deposition or subsequently thereto consolidating said deposit of amorphous particles into a virtually nonporous body; the improvement comprising utilizing a halide-free, organosilicon-R compound in vapor form having the following properties:
(1) a Si-R bond dissociation energy that is no higher than the dissociation energy of the Si-O bond; (2) a boiling point no higher than 350°C; and (3) which, upon pyrolysis and/or hydrolysis, will produce decomposition products beside SiO₂ which are deemed to be environmentally safe or the emissions are below acceptable governmental standards.
Abstract:
A method for fabricating optical fibers having a rare-earth doped core and a fused silica cladding includes inserting a rare-earth doped soft glass rod into a fused silica tube, the ratio of the outer diameter (OD) to the inner diameter (ID) of the fused silica tube being at least 2 and as large as 50; heating the rod and tube combination in a furnace to selectively volatilize volatile constituents of the soft glass rod which are responsible for the low softening point so that the final composition of the core consists predominantly of SiO₂ and the desired dopants such as rare earths, alkaline earths or other low vapor pressure materials; and drawing the perform into an optical fiber.
Abstract:
An electrooptic photonic crystal fiber having a central part forming a Bragg structure, the central part comprising a core (1) made homogeneously from low refractive glass and pre-designed set of altering claddings made of high refractive (2) and low refractive glasses (3); and a peripheral part forming an envelope of the Bragg structure, the peripheral part (5, 7) being formed from multicomponent glasses with low viscosity in the fiber drawing temperature range. Metallic electrodes (8) are embedded in the peripheral part adjacent to the central part on diametrically opposite sides. The method for manufacturing such a fiber includes drawing of separate rods from glass bars constituting fiber elements, drawing of electrodes in the form of metal filled glass capillaries, bundling a package with hexagonal section and internal Bragg structure from the rods, drawing a rod from the package, assembling a secondary package from the rods with Bragg structure, electrode capillaries and glass rods forming the envelope of Bragg structure, re-drawing the secondary package into a preform and then into photonic crystal electrooptic fiber.
Abstract:
A method of making fused silica includes generating a plasma, delivering reactants comprising a silica precursor into the plasma to produce silica particles, and depositing the silica particles on a deposition surface to form glass; also a photomask material obtainable by the method is claimed.