Abstract:
Bei einem bekannten Verfahren erfolgt die Herstellung eines Quarzglas-Bauteils für eine für eine UV-Strahlenquelle durch Erschmelzen von SiO 2 -haltiger Körnung. Um hiervon ausgehend ein kostengünstiges Verfahren anzugeben, mittels dem ein Quarzglas-Bauteil erhalten wird, das sich durch hohe Strahlenbeständigkeit auszeichnet, wird erfindungsgemäß vorgeschlagen, dass synthetisch erzeugte Quarzkristalle zu einem Vorprodukt erschmolzen werden, das aus Quarzglas besteht, das Hydroxylgruppen in einer Anzahl enthält, die größer ist als die Anzahl an SiH-Gruppen, und dass zur Beseitigung von SiH-Gruppen das Vorprodukt einer Temperbehandlung bei einer Temperatur von mindestens 850 °C unterzogen und dabei das Quarzglas-Bauteil erhalten wird. Bei dem erfindungsgemäßen Quarzglas-Bauteil ist das Quarzglas aus synthetisch erzeugten Quarzkristallen erschmolzen, und es weist einen Gehalt an SiH-Gruppen von weniger als 5 x 10 17 Molekülen/cm 3 auf.
Abstract translation:在已知的方法制备用于UV辐射源的石英玻璃部件的通过SiO 2的含谷物的融化。发生 要指定此基础上具有成本效益的方法,通过其获得石英玻璃元件,其特征是高耐辐射性,本发明提出的是合成产生的熔融石英的晶体,以形成一个初步的产品,它由石英玻璃含有以羟基数 比SiH基团的数量越多,并且进行消除SiH基团,所述前体的退火在至少850℃的温度,而获得石英玻璃元件。 在本发明的石英玻璃元件,合成产生的石英晶体的石英玻璃被熔化并具有小于5×10 <17>分子/ cm <3>的SiH基团的含量。
Abstract:
The present invention relates to a method and apparatus for making a silica soot particle optionally doped. Preferably the method is substantially free of the step of combusting a fuel and substantially free of the step of forming a plasma. Preferably, the apparatus is devoid of a heating element associated with both combustion and formation of a plasma. A preferred technique for at least one heating step for forming the soot particle is induction heating. In general terms, the method and apparatus for coming out the method avoid introducing water (H2, OH, H2O) into the silica particles or deposit and can be used to manufacture preforms for optical fibers.
Abstract:
Disclosed is a method for fabricating an optical fiber preform using a double torch in MCVD, which includes a first process of heating a quartz tube (10) at a temperature lower than a sintering temperature by using a first torch (21) with putting reaction gas, oxygen gas and dehydration gas into the tube so that soot particles are generated and deposited, and heating the tube to a predetermined temperature by using a second torch (22) spaced apart from the first torch after the first torch (21) passes so that moisture in the soot particles is removed; and a second process of conducting dehydration for removing moisture in the soot particles by use of the first torch (21) again, and heating the tube above a sintering temperature by using the second torch (22) so that the soot particles free from moisture are vitrified.
Abstract:
A method of forming an alkali metal oxide-doped optical fiber by diffusing an alkali metal into a surface of a glass article is disclosed. The silica glass article may be in the form of a tube or a rod, or a collection of tubes or rods. The silica glass article containing the alkali metal, and impurities that may have been unintentionally diffused into the glass article, is etched to a depth sufficient to remove the impurities. The silica glass article may be further processed to form a complete optical fiber preform. The preform, when drawn into an optical fiber, exhibits a low attenuation.
Abstract:
A method of manufacturing an optical fibre, comprises: (i) forming a preform (10) for drawing into the fibre, the preform (10) comprising a bundle of elongate elements (20,50) arranged to form a first region that becomes a cladding region of the fibre and a second region that becomes a core region of the fibre; (ii) drawing the preform (10) into the fibre. The bundle of elongate elements (20,50) comprises a plurality of elongate elements (20) of a lower purity dielectric material and at least one elongate element (50) of a higher purity dielectric material. The first region comprises a plurality of the lower purity elements (20) and the second region comprises the higher purity element (50).
Abstract:
An apparatus for transporting an optical signal is provided. The apparatus includes sections of optical fiber span with at least one section negative dispersion, negative slope fiber positioned at a distance from the output. A pump light emitting device optically coupled to the optical fiber span near the output is provided for generating an amplification signal.
Abstract:
The invention relates to a crucible characterized in that said crucible is of high purity and high opacity or exhibits low transmission characteristics in the IR range and is derived from a quartz glass crucible known in prior art. Said crucible known in prior art has a crucible body which is symmetrical about a rotational axis and said body is made of opaque quartz glass, whereby the crucible has an outer zone (3) made of opaque quartz glass which projects radially inwards to an inner zone (2) made of transparent quartz glass having a density of at least 2.15 g/cm . The crucible body (1) is made of a synthetic SiO2 granulate with a specific surface (according to BET) in the range of 0.5 m /g to 40 m /g and having a stamp density of at least 0.8 g/cm and is produced from an at least partially porous agglomerate of SiO2 primary particles. A method for producing said quartz glass crucible is characterized according to the invention in that during the production of said crucible, an at least partially porous agglomorate of synthetically produced SiO2 granulate made of SiO2 primary particles is produced having a specific surface (according to BET) in the range of 0.5 m /g to 40 m /g and a stamp density of at least 0.8 g/cm . Heating is performed in such a manner that a vitrification front progresses from the inside to the outside of an inner zone (4) made of transparent quartz glass.