Optical fiber transmission of 2 kW cw YAG laser and its practical application to welding

Takashi Ishide; Osa Matumoto; Yasumi Nagura; Tadashi Nagashima

doi:10.1117/12.20585

1 August 1990 Optical fiber transmission of 2 kW cw YAG laser and its practical application to welding

Takashi Ishide, Osa Matumoto, Yasumi Nagura, Tadashi Nagashima

Proceedings Volume 1277, High-Power Solid State Lasers and Applications; (1990) https://doi.org/10.1117/12.20585
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

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.

Citation Download Citation

Takashi Ishide, Osa Matumoto, Yasumi Nagura, and Tadashi Nagashima "Optical fiber transmission of 2 kW cw YAG laser and its practical application to welding", Proc. SPIE 1277, High-Power Solid State Lasers and Applications, (1 August 1990); https://doi.org/10.1117/12.20585

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