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Proceedings Paper

Optical fiber transmission of 2 kW cw YAG laser and its practical application to welding
Author(s): Takashi Ishide; Osa Matumoto; Yasumi Nagura; Tadashi Nagashima
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Paper Abstract

The YAG laser has an excellent characteristic that makes beam transmission with optical fibers. In addition, the oscillator of the 2 kW class has recently been developed, and so its applications are changing largely from conventional fine material processing. The authors have adopted the YAG laser welding that uses optical fibers favorable to application to narrow, complicated areas. First, the authors have analyzed the beam intensity distribution near the focusing point using ray tracing method, and manufactured the compact condensing optical lens systems, and metal mirrors which have high reflectivity and durability that can be inserted in the tubes of about 16 mm I.D. to weld them. And also have developed the beam transmission system that can transmit beam for a long distance of about 200 m using small diameter optical fibers. In addition, with these systems the welding conditions to get about 2 mm penetration for stable welding has been obtained and applied YAG laser welding of steam generator tubes in practical nuclear power plants.

Paper Details

Date Published: 1 August 1990
PDF: 11 pages
Proc. SPIE 1277, High-Power Solid State Lasers and Applications, (1 August 1990); doi: 10.1117/12.20585
Show Author Affiliations
Takashi Ishide, Mitsubishi Heavy Industries, Ltd. (Japan)
Osa Matumoto, Mitsubishi Heavy Industries Ltd. (Japan)
Yasumi Nagura, Mitsubishi Heavy Industries, Ltd. (Japan)
Tadashi Nagashima, Mitsubishi Heavy Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 1277:
High-Power Solid State Lasers and Applications
Clive L. M. Ireland, Editor(s)

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