Methods for making active laser fibers

US9255026B2 · kind B2 · utility

Assignee

• J-FIBER GMBH · DE

Inventors

• Jurgen Rosenkranz · Mönchengladbach, DE
• Wolfgang Haemmerle · Jena, DE
• Lothar Brehm · Jena, DE
• Katrin Roessner · Jena, DE
• Robert Hanf · Eisenberg, DE

Key dates

• Filing date: Mar 6, 2013
• Grant date: Feb 9, 2016
• Expiry date: May 30, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2205/40
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry.