High-power fiber laser amplifier and fiber laser oscillator

US7369582B2 · kind B2 · utility

Assignee

• TRUMPF Laser GmbH + Co. KG · DE

Inventors

• Maite Kumkar · Schramberg, DE
• Andreas Voss · Essen, DE

Key dates

• Filing date: Dec 5, 2006
• Grant date: May 6, 2008
• Expiry date: Dec 5, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/1618
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A high-power fiber laser amplifier with a laser wavelength of about 1060 to 1100 nm and an average laser power of more than about 500 W and an almost diffraction-limited beam quality (M2<1.5) comprises a double-clad laser fiber that has a separate, laser-active fiber core with an outer diameter of at least 20 μm and a pump core that surrounds the fiber core and has an outer diameter of at least 50 μm, and ytterbium-doped solid state laser that emits pump light with a wavelength of approximately 1030 nm, a beam quality of M2< of approximately 30 and a laser power of at least approximately 600 watts, for pumping the double-clad laser fiber.