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AssigneeHeraeus Quarzglas GmbH & Co. KG
InventorsManuel Rosenberger, Michael Hünermann, Martin Trommer, Kay Schuster, Steffen Weimann, Oliver Ganz
Estimating the term…
Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved by providing anti-resonant element preforms which have at least one respective ARE outer tube and/or at least one respective ARE inner tube, wherein the ARE outer tube and/or the ARE inner tube is produced using a vertical drawing method without molding tools.
Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core, which sheath region comprises a plurality of anti-resonance elements, comprising the method steps of:
Method according to any one of the preceding claims, characterized in that the ARE outer tube (24a) or the ARE inner tube (24b) has an outer surface, and that, after completion of the vertical drawing process, the outer surface is free of particles larger than 0.005 mm, and that the ARE outer tube (24a) or the ARE inner tube (24b) consists of quartz glass containing a tungsten concentration of less than 2 ppb by weight.
Method for producing a preform for an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core, which sheath region comprises a plurality of anti-resonance elements, comprising the method steps of:
Dependencies are inferred from the claim text.