Methods for producing a hollow-core fiber and for producing a preform for a hollow-core fiber

US12209045B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Manuel Rosenberger · Hanau, DE
• Enrico Ehrentraut · Hanau, DE
• David Kostka · Hanau, DE
• Martin Trommer · Bitterfeld-Wolfen, DE
• Steffen Weimann · Hanau, DE
• Michael Hünermann · Alzenau, DE
• Kay Schuster · Hanau, DE

Key dates

• Filing date: Jul 15, 2020
• Grant date: Jan 28, 2025
• Expiry date: Oct 14, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2203/42
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

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 in that a secondary preform is formed which has an outer diameter ran…