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Proceedings Paper

Laser applications to fluid materials: laser-induced cavitation in cryogenic liquid and gas decomposition by laser
Author(s): Kazuo Maeno; Hitoshi Sato; Seiichi Endo
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Paper Abstract

In this paper laser applications to fluid dynamical problems are presented. Firstly as for the recent research on cavitations, pulsed-laser-induced cavitation bubble in liquid nitrogen is studied. The bubble is produced by focused and pulsed irradiation of second harmonics of YAG laser in the cryostat. The dynamics of laser-induced bubble is visualized by high-speed shadowgraphs and schlieren photographs by an image-converter camera (Imacon-790). Bubble and solid wall interactions are also investigated. Based on the results obtained, a novel laser surface processing technology using the pulse-laser-induced cavitation bubbles is secondly proposed. The possibility of cold material surface processing by produced cavitation bubble is discussed including the cryogenic range. Furthermore, discussing by the fundamental results of the experiment of laser-gas molecular absorption, the possibility of decomposition of environmental gases by strong CW CO2 laser irradiation is also studied. Freon 12, 113, and other environmental gases including SF6 are very tough to be decomposed, and they break effectively the ozone molecules at high altitude above the Earth, or they heat up the earth. The wavelength range of the infrared laser is suitable for the molecular absorption to increase their temperature to be ionized. The possibility and trial experiments are discussed.

Paper Details

Date Published: 7 May 1999
PDF: 13 pages
Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); doi: 10.1117/12.347626
Show Author Affiliations
Kazuo Maeno, Chiba Univ. (Japan)
Hitoshi Sato, National Aerospace Lab. (Japan)
Seiichi Endo, Maruso Co. Ltd. (Japan)


Published in SPIE Proceedings Vol. 3571:
Tenth International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Dimitar V. Stoyanov, Editor(s)

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