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:
Um ausgehend von den bekannten Verfahren zur Herstellung von Glas, das mit mehreren, seinen Brechungsindex unterschiedlich verändernden Dotierstoffen dotiert ist, von denen ein erster Dotierstoff bei der Herstellung eines wenigstens im zu dotierenden Bereich porösen Vorprodukts des Glases eingebracht wird und danach das den ersten Dotierstoff enthaltende Vorprodukt in einer, einen weiteren Dotierstoff enthaltenden Atmosphäre erhitzt wird und das Vorprodukt zu dem Glas gesintert wird, die Art und die Konzentration der Dotierstoffe im Glas in weiten Grenzen variierbar und gezielt beeinflußbar zu gestalten, wird erfindungsgemäß vorgeschlagen, daß die Erhitzung in einer Atmosphäre erfolgt, in der von den im chemischen Gleichgewicht zwischen dem Vorprodukt und der Atmosphäre bei der Erhitzungstemperatur vohandenen gasförmigen Komponenten ein Reaktionsprodukt mindestens des ersten und des weiteren Dotierstoffs und eine den weiteren aber nicht den ersten Dotierstoff enthaltende Dotierungs-Komponente in vorgebbaren Konzentrationen enthalten sind, wobei der Atmosphäre der erste und der weitere Dotierstoff an sich oder in Form einer Verbindung zugeführt werden.
Abstract:
On décrit un procédé permettant de fabriquer un objet de silice synthétique par l'oxydation en phase vapeur d'un matériau précurseur de silice dans une flamme, 60 % ou plus du dioxyde de silicium dans le produit déposé étant dérivé par oxydation de (A) un ou plusieurs composés de dioxyde de silicium volatile à chaîne linéaire ayant la formule générale: R3Si.O(SiR2O)n.SiR3 et/ou (B) un ou plusieurs composés de dioxyde de silicium volatils cycliques ayant la formule générale: SinOn(R)2n. On décrit également des poudres de fumées (2) dopées ou non dopées, des suies de silice poreuse ou des corps complètement densifiés obtenus grâce audit procédé.
Abstract:
A method of forming a doped silica-titania glass is provided. The method includes blending batch materials comprising silica, titania, and at least one dopant. The method also includes heating the batch materials to form a glass melt. The method further includes consolidating the glass melt to form a glass article, and annealing the glass article.
Abstract:
Annealing treatments for modified titania-silica glasses and the glasses produced by the annealing treatments. The annealing treatments include an isothermal hold that facilitates equalization of non-uniformities in fictive temperature caused by non-uniformities in modifier concentration in the glasses. The annealing treatments may also include heating the glass to a higher temperature following the isothermal hold and holding the glass at that temperature for several hours. Glasses produced by the annealing treatments exhibit high spatial uniformity of CTE, CTE slope, and fictive temperature, including in the presence of a spatially non-uniform concentration of modifier.
Abstract:
Laser waveguides, methods and systems for forming a laser waveguide are provided. The waveguide includes an inner cladding layer surrounding a central axis and a glass core surrounding and located outside of the inner cladding layer. The glass core includes a laser-active material. The waveguide includes an outer cladding layer surrounding and located outside of the glass core. The inner cladding, outer cladding and/or core may surround a hollow central channel or bore and may be annular in shape.
Abstract:
A substrate that is suitable for an EUV mask or an EUV mask blank and excellent in flatness, is provided.A substrate for an EUV mask blank, which is made of a silica glass containing from 1 to 12 mass % of TiO2, wherein the surface roughness (rms) in a surface quality area of the substrate is at most 2 nm, and the maximum variation (PV) of the stress in the surface quality area of the substrate is at most 0.2 MPa.
Abstract:
An optical fiber for transmitting ultraviolet ray, comprising a core (5) formed of a silica glass containing a specified amount of fluorine and a clad (6a) formed of a silica glass containing a specified amount of fluorine or boron, a clad (6b) using an ultraviolet ray transmitting resin, or a clad (6c) having hollow holes (H), a protective layer installed on the outer periphery of the clad, and a protective layer covering layer further installed on the protective layer, wherein hydrogen treatment is applied to the core, clad, and protective layer so that the core, clad, and protective cover are not deteriorated, particularly, by the radiation of ultraviolet ray with high transmittance, whereby first the transmittance of ultraviolet ray of the optical fiber can be increased and the deterioration of the optical fiber by the radiation of ultraviolet ray thereon can be eliminated and second vacuum ultraviolet ray and deep ultraviolet ray can be propagated with a high transmittance, the deterioration by the radiation of ultraviolet ray thereon can be reduced, and a prescribed sharp part can be formed at the tip part of the optical fiber by etching; an optical fiber probe (1), comprising a sharp part (3) formed by sharpening the tip part of the optical fiber (2) with etchant and a metallic film (4) for light shielding formed on the outer peripheral surface of the sharp part (3).