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Proceedings Paper

High-beam quality and high-average-power industrial CO2 lasers
Author(s): Yushi Takenaka; Koji Yasui; Shigenori Yagi
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Paper Abstract

High power and high beam quality cw carbon-dioxide lasers using new resonators with a phase-unifying output coupler are presented. The phase-unifying output coupler has a circular partial-reflection region in the center surrounded by an antireflection region. The two laser beams that fall onto the two regions of the phase-unifying output coupler have a phase difference from each other when they pass through these regions. The phase difference is structurally canceled out by introducing a stepwise groove outside the phase-unifying output coupler. The new resonators operate in a large volume fundamental mode that is mainly determined by the phase-unifying output coupler. A 5 kW diffraction limited output beam that is promising for industrial laser application is obtained experimentally when the new resonators are applied to high power cw carbon-dioxide lasers. In laser materials processing, we can achieve a penetration depth of 5 mm at a speed of 5 m/min for high speed laser welding of stainless steel. Furthermore, we can cut 1 mm thick mild steel at a speed of 58 m/min and 0.5 mm thick mild steel at a speed of 95 m/min for high speed laser cutting.

Paper Details

Date Published: 4 April 1997
PDF: 14 pages
Proc. SPIE 2987, Gas and Chemical Lasers and Applications II, (4 April 1997); doi: 10.1117/12.271572
Show Author Affiliations
Yushi Takenaka, Mitsubishi Electric Corp. (Japan)
Koji Yasui, Mitsubishi Electric Corp. (Japan)
Shigenori Yagi, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 2987:
Gas and Chemical Lasers and Applications II
Robert C. Sze; Ernest A. Dorko, Editor(s)

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