Abstract:
PROBLEM TO BE SOLVED: To provide a substrate which has an excellent flatness suitable for an EUV (Extreme UltraViolet) mask or an EUV mask blanks. SOLUTION: A substrate 11 for an EUV mask is made of a material of silica glass containing 1-12 wt.% of TiO 2 , and has a surface roughness (rms) of 2 nm or below in a surface quality region. The substrate has a maximum stress variation (PV) of 0.2 MPa or below in a the surface quality region and has a thermal expansion coefficient of 200 ppb/°C in a temperature range of 0-100°C. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
제공된도핑된실리카-티타니아유리제품은, (i) 실리카-티타니아계유리, (ⅱ) 불소도펀트, 및 (ⅲ) 제2 도펀트를포함하는유리조성물을갖는유리제품을포함한다. 상기불소도펀트는 5 wt.%까지의불소농도를가지며, 및상기제2 도펀트는 50ppm 내지 6 wt.%의총 산화물농도로 Al, Nb, Ta, B, Na, K, Mg, Ca 및 Li 산화물로이루어진군으로부터선택된하나이상의산화물을포함한다. 더욱이, 상기유리제품은 20℃에서 0.5 ppb/K미만의팽창률기울기를갖는다. 상기제2 도펀트는선택적일수 있다. 상기유리제품의조성물은또한 100ppm 미만의 OH 농도를함유할수 있다.
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 active optical fibre, including: a core; an inner cladding substantially surrounding the core, whereby the core and the inner cladding form an area configured to propagate pump radiation; an outer cladding comprised of at least a third material with at least a third refractive index substantially surrounding the inner cladding, the third refractive index being smaller than the second refractive index, whereby the outer cladding confines pump radiation to the core and the inner cladding; and a coating comprised of a thermally conductive material substantially surrounding the outer cladding, wherein the inner cladding is configured to reduce impact of spatial hole-burning on absorption of the pump radiation as the pump radiation propagates through the active optical fibre, and wherein the thermally conductive material of the coating supports a reduced temperature increase between the area and an outer surface of the coating.
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:
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.