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Proceedings Paper

High-power laser-fibers structure for surface ablation cleaning under complicated circumstance
Author(s): Xianglin Zhou; Kazuo Imasaki; Hiroyuki Furukawa; Hideo Umino; Kohji Sakagishi; Sadao Nakai; Chiyoe Yamanaka
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Paper Abstract

High power Nd:YAG laser beam with wavelength 1.064micrometers , pulse-width 20 and 100 pico-second was focused onto Zn coated target; and separated by beam splitter and delivered via optical fibers. Some key problems of ultra short pulsed high power laser beam transporting in optical fiber were involved and solved; laser ablation effect by laser irradiation and after optical fiber transportation were comparatively studied. Ablation rate was defined as ablated volume to laser fluence and used as a description of ablation ability. The relationship of ablation rate with laser fluence was plotted and optimum condition was found. Corresponding to the optimal condition, ablation effect in cases of 20 and 100 pico- second pulse-width, 90 degree(s) and 20 degree(s) laser incident angles, using spherical lens and cylindrical lens for laser beam focusing was compared respectively. It was shown that if other conditions unchanged, used spherical lens and cylindrical lens, ablation rate was almost same, but it was high as pulse-width equal to 100ps or laser incident angle equal to 90 degree(s) than as 20ps or 20 degree(s) respectively. In addition, laser beam over 5.6 watt, transporting rate near 90 per was output at the end of the optical fiber. Using the laser was this output power, the same thickness Zn coating was completely removed. Basing on this experiment, the possibility of laser surface ablation cleaning under complicated circumstance was confirmed.

Paper Details

Date Published: 25 October 2000
PDF: 10 pages
Proc. SPIE 4095, Laser Beam Shaping, (25 October 2000); doi: 10.1117/12.405253
Show Author Affiliations
Xianglin Zhou, Osaka Univ. (Japan)
Kazuo Imasaki, Osaka Univ. (Japan)
Hiroyuki Furukawa, Osaka Univ. (Japan)
Hideo Umino, Atox Corp. (Japan)
Kohji Sakagishi, Atox Corp. (Japan)
Sadao Nakai, Osaka Univ. (Japan)
Chiyoe Yamanaka, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4095:
Laser Beam Shaping
Fred M. Dickey; Scott C. Holswade, Editor(s)

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