Hollow-sapphire and metal–dielectric-coated hollow-glass waveguides have been used to deliver CO2 laser power for industrial laser applications. The transmission, bending loss, and output-beam properties of these waveguides are described. The bore sizes of the hollow-sapphire waveguides were 1070 and 790 μm, and the hollow-glass waveguide had a bore of 700 μm. The waveguides ranged in length from 1.1 to 1.5 m. The sapphire waveguides were bent to 90°, and the hollow-glass waveguides were bent into a full 360° loop. We delivered a maximum of 1.8 kW through the 1070-μm-bore sapphire waveguide and 1.0 kW through the hollow-glass waveguide. All the hollow waveguides incorporated a water jacket to prevent overheating.
© 1996 Optical Society of America
Original Manuscript: December 22, 1994
Revised Manuscript: August 23, 1995
Published: January 20, 1996
Ricky K. Nubling and James A. Harrington, "Hollow-waveguide delivery systems for high-power, industrial CO2 lasers," Appl. Opt. 35, 372-380 (1996)