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Proceedings Paper

Observation of water-shock-wave propagation emanated from the roughened optical fiber end surface by the pulse laser energy input
Author(s): Motonao Nakahara; Kunihito Nagayama
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Paper Abstract

Pressure enhancement of the generated shock waves in water has been found, when pulse laser energy is transmitted through an optical fiber whose end surface is intentionally roughened. More effective high-pressure shock generation can be possible by the aluminum coating on the roughened fiber surface. In case of the moderate laser energy of about 50 mJ input to the fiber, it is found that the phenomena are dependent on (1) the roughness, (2) the fiber diameter, and (3) the ambient medium. Shock wave generation can be detected successively by the laser input, but found to degrade down. Cavitation bubbles have also been observed after each shot. When the fiber end is in air, an intense and long-stretched flash can be observed. We have observed the phenomena by the pulse laser shadowgraphy.

Paper Details

Date Published: 22 June 1999
PDF: 6 pages
Proc. SPIE 3516, 23rd International Congress on High-Speed Photography and Photonics, (22 June 1999); doi: 10.1117/12.350494
Show Author Affiliations
Motonao Nakahara, Fukuoka Institute of Technology (Japan)
Kunihito Nagayama, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 3516:
23rd International Congress on High-Speed Photography and Photonics
Valentina P. Degtyareva; Mikhail A. Monastyrski; Mikhail Ya. Schelev; Alexander V. Smirnov, Editor(s)

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