Laser applications to fluid materials: laser-induced cavitation in cryogenic liquid and gas decomposition by laser

Kazuo Maeno; Hitoshi Sato; Seiichi Endo

doi:10.1117/12.347626

7 May 1999 Laser applications to fluid materials: laser-induced cavitation in cryogenic liquid and gas decomposition by laser

Kazuo Maeno, Hitoshi Sato, Seiichi Endo

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Proceedings Volume 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications; (1999) https://doi.org/10.1117/12.347626
Event: 10th International School on Quantum Electronics: Lasers: Physics and Applications, 1998, Varna, Bulgaria

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.

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Kazuo Maeno, Hitoshi Sato, and Seiichi Endo "Laser applications to fluid materials: laser-induced cavitation in cryogenic liquid and gas decomposition by laser", Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); https://doi.org/10.1117/12.347626

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KEYWORDS

Liquids

Gases

Solids

Cavitation

Cryogenics

Laser processing

Carbon dioxide lasers

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