Abstract:
A synthetic quartz glass for an optical member which is free from compaction and rarefaction is obtained. A synthetic quartz glass for an optical member to be used for an optical device employing a light having a wavelength of at most 400 nm and at least 170 nm as a light source, which contains substantially no oxygen excess defects, dissolved oxygen molecules nor reduction type defects, which has a chlorine concentration of at most 50 ppm and a OH group concentration of at most 100 ppm, and which contains oxygen deficient defects within a concentration range of at most 5 ~10¿14? defects/cm¿3? and at least 1 ~10¿13? defects/cm¿3?. The fluorine concentration is preferably at most 100 ppm.
Abstract translation:得到不含压实和稀释的用于光学构件的合成石英玻璃。 用于光学构件的合成石英玻璃,其用于使用波长最多为400nm且至少170nm的光作为光源的光学元件,其基本上不含氧过剩缺陷,溶解的氧分子或还原型 缺陷,其氯浓度最多为50ppm,OH基浓度为至多100ppm,并且在氧浓度范围内至多为5〜10×14×缺陷/ cm 3的含氧缺陷。 至少1〜10〜13? 缺陷/cm¿3?. 氟浓度优选为100ppm以下。
Abstract:
An optical fiber includes a glass fiber having a glass core and a cladding which contains voids spaced apart from the core. The voids act as trapping sites for ingressing molecules from the surrounding environment, thereby reducing the effect of such molecules on the fiber's lighttransmission properties.
Abstract:
A method for preparing high-purity, bulk fused silica includes supplying silane gas (11), a gaseous fuel (8), and oxygen gas (10B) to a combustion burner (14). A fuel and oxygen mixture (13) is produces when fuel (8) and oxygen gas (10A) in a premixing chamber (12). Nitrogen gas (17A) may also be supplied to the burner (14) which is located in the crown (16) of a furnace (15). Silica particles are formed by passing the silane gas into a flame formed by the combustion reaction of the gaseous fuel with the oxygen gas while maintaining the ratio of the flow rate of the gaseous fuel to the flow rate of the silane gas no less than twelve and the ratio of the flow rate of the gaseous fuel to the flow rate of the oxygen gas no less than three. Silane flow rates are controlled with a mass flow controller (51) and the flow of other gasses is monitored with flow meters (49). The silica particles formed are immediately deposited onto a hot bait (18) inside a containment vessel (21) to form a boule (19).
Abstract:
A method of forming quartz glass by pressurizing at least one set of opposing planes of synthetic quartz bulk by a pressurizing means, characterized in that an air-permeable elastic member is disposed between the pressurizing means and the above planes of the synthetic quartz bulk pressurized by the pressurizing means and the synthetic quartz bulk is pressurized by the pressurizing means via the elastic member, whereby it is possible to satisfactorily control the amount of bubbles remaining in the quartz glass formed body after formation to thereby provide a method of producing quartz glass having excellent optical characteristics with an excellent yield.
Abstract:
An article of relatively pure silica, and a furnace and method of producing the article. The article is produced by collecting molten silica particles (24) in a refractory furnace in which at least a portion of the refractory has been exposed to a halogen-containing gas to react with contaminating metal ions in the refractory.
Abstract:
The invention relates to a method for producing a silica glass article, involving method steps i.) providing a silica granulate, ii.) forming a glass melt from the silica granulate, and iii.) forming a silica glass article from at least some of the glass melt, the silica granulate being obtained by providing and processing a silica powder. The invention also relates to a silica granulate obtained by providing a silica powder and processing same. The invention further relates to a silica glass article that can be obtained by said method. The invention finally relates to an optical waveguide, an illuminant and a molded article, each of which can be obtained by further processing the silica glass article.
Abstract:
The invention relates to a method for producing a silica glass article, involving method steps i.) providing a silica granulate made of a pyrogenically produced silica powder, ii.) forming a glass melt from the silica granulate, iii.) forming a silica glass article from at least some of the glass melt, iv.) comminuting the silica glass article so as to obtain silica glass grains, v.) processing the silica glass article to obtain a preform, and vi.) forming an opaque silica glass article from the preform. The invention further relates to an opaque silica glass article that can be obtained by said method. The invention also relates to a reactor and an arrangement, each of which can be obtained by further processing the opaque silica glass article.
Abstract:
The invention relates to an optical fiber preform (20) comprising a primary preform (21) and one or more purified silica-based overclad layers (22) surrounding said primary preform (21), the purified silica-based overclad layers (22) comprising lithium and aluminium, and having a ratio between lithium concentration [Li] and aluminium concentration [Al] satisfying the following inequality (Formula (I)). 1.103≦̸[Li]/[Al]≦̸20.103 (1)