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AssigneeHeraeus Quarzglas GmbH & Co. KG
InventorHeinz Fabian
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The aim of the invention is to improve a known quartz glass cylinder for the production of an optical component, comprising an inner drilling, which is mechanically machined to size and provided with an etched structure by means of an etching treatment, subsequent to the mechanical machining, such that in the application thereof for production of pre-forms and optical fibres, few bubbles arise along the boundary surface between core and sleeve. Said aim is achieved, whereby the etched structure comprises striations with a maximum depth of 2.0 mm and a maximum width of 100 μm. A method for production of such a quartz glass cylinder mechanically machined to size is characterised in that the mechanical machining comprises several serial removal processes with successively lower removal depths, whereby after the last removal process the inner drilling has sub-surface striations with a maximum depth of 2 mm and the inner drilling is subsequently subjected to an etching treatment such that an etching removal with a maximum depth of 50 μm is achieved.
A quartz glass article for producing an optical component, the quartz glass article comprising a quartz glass cylinder having an inner bore, the inner bore being mechanically treated to a final dimension and having an etched structure wherein the etched structure is produced using an etching treatment following the mechanical treatment, wherein the etched structure has cracks therein each having a depth of not more than 2.0 mm and a width of not more than 100 μm.
Dependencies are inferred from the claim text.