Abstract:
The present invention provides an optical fiber providing high photosensitivity in the absence of hydrogen loading as well as a low numerical aperture. One aspect of the present invention relates to an optical fiber including a core (22), the core comprising silica doped with at least about 6mol% germania and at least about 0.9wt% fluorine; and a cladding (24) surrounding the core. The optical fiber of the present invention is suitable for the production of fiber Bragg gratings.
Abstract:
Optical wave guides made of quartz glass with reduced infrared absorption and reduced attenuation coefficients are made of a glass which consists of atoms with a mass-number higher than that of the natural isotope ratio. The quartz glass or doped quartz glass consists of silicon atoms of which most or all have the mass-numbers 29 and/or 30, as well as oxygen atoms of which most or all consist of isotopes with the mass-numbers 17 and/or 18. For doping with germanium atoms with higher mass-numbers than in the natural isotope mixture, atoms of the 76Ge isotope are preferably used. For optical wave guides based on quartz glass with attenuation coefficients below 0.15 dB/km, glass with atoms of preferably 30Si and/or 18O are preferably used. Such optical wave guides are also suitable for transmitting high-energy, pulsed or continuous laser light in a wavelength range from 2.0 to 3.0 νm. These optical wave guides are also suitable for transmitting holmium laser light of 2.1 νm and er laser light with a wavelength equal to 2.79 and 2.94 νm.
Abstract:
A process is described for making organometallic complexes suitable for use in the production of glass or ceramic articles by a vapour phase oxidation process. The complex has the formula M(hfa)₂.nTHF wherein M is Mg or Zn, hfa is hexafluoroacetylacetonate, THF is tetrahydrofuran and n is 2 which is prepared by
(a) providing an adduct of the complex M(hfa)₂ which comprises one or more adducted water molecules; (b) dissolving the water-containing adduct in excess THF to form a reaction mixture wherein the adduct will react with the THF to replace the adducted molecules by THF; (c) evaporating the reaction mixture to dryness to form a solid residue; and (d) collecting the M(hfa)₂.nTHF product from the residue by sublimation of the residue.
Abstract translation:描述了一种通过气相氧化方法制备适用于生产玻璃或陶瓷制品的有机金属络合物的方法。 络合物具有式M(hfa)2,其中M是Mg或Zn,hfa是六氟乙酰丙酮化物,THF是四氢呋喃,n是2,其通过(a)提供复合物M(hfa)2的加合物制备,其包含 一个或多个加合水分子; (b)将含水加合物溶解在过量的THF中以形成反应混合物,其中加合物将与THF反应以用THF代替加合的分子; (c)将反应混合物蒸发至干,形成固体残余物; 和(d)通过残余物的升华从残余物中收集M(hfa)2 nFF产物。 C
Abstract:
Un article de polycarbonate non opaque revetu de verre resistant a l'abrasion, aux rayures, et aux solvants, comprend un substrat de polycarbonate ayant sur sa surface (i) une premiere couche intermediaire contenant les produits de photoreaction de certains monomeres acryliques polyfonctionnels; et (ii) une couche superieure de verre deposee a la vapeur.
Abstract:
Quartz glass body has a glass structure essentially without oxygen defect sites and a base transmission of at least 80% in the wavelength region of 155 - 250 nm at a through radiation length of 10 mm. The relative change of the base transmission lies at a maximum of one percent over the utilizable surface of the body. An Independent claim is also included for a process for the production of a quartz glass body comprising hydrolyzing a silicon compound in a flame producing fine quartz glass particles; depositing the particles onto a support forming a porous body; and heat treating the body in two steps at 850-1600 degrees C, the last step comprising sintering at 1300-1600 degrees C in an atmosphere containing hydrogen or oxygen as a non-ignitable mixture.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung eines dotierten SiO 2 - Schlickers indem eine SiO 2 -Suspension mit mindestens einer Dotierlösung in Wechselwirkung gebracht wird, wobei die SiO 2 -Suspension oder/und die Dotierlösung als Sprühnebel aufeinander einwirken, dessen mittlerer Tropfendurchmesser im Bereich zwischen 10 μm und 100 μm liegt. Die Erfindung betrifft weiterhin die Verwendung eines mittels des Sprühnebelverfahrens dotierten SiO 2 -Schlickers zur Herstellung von dotiertem Quarzglas, insbesondere zur Herstellung von laseraktivem Quarzglas.
Abstract:
Optical wave guides made of quartz glass with reduced infrared absorption and reduced attenuation coefficients are made of a glass which consists of atoms with a mass-number higher than that of the natural isotope ratio. The quartz glass or doped quartz glass consists of silicon atoms of which most or all have the mass-numbers 29 and/or 30, as well as oxygen atoms of which most or all consist of isotopes with the mass-numbers 17 and/or 18. For doping with germanium atoms with higher mass-numbers than in the natural isotope mixture, atoms of the Ge isotope are preferably used. For optical wave guides based on quartz glass with attenuation coefficients below 0.15 dB/km, glass with atoms of preferably Si and/or O are preferably used. Such optical wave guides are also suitable for transmitting high-energy, pulsed or continuous laser light in a wavelength range from 2.0 to 3.0 mu m. These optical wave guides are also suitable for transmitting holmium laser light of 2.1 mu m and er laser light with a wavelength equal to 2.79 and 2.94 mu m.