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Proceedings Paper

Laser acoustics in water induced by high power CO2 pulsed laser
Author(s): Qingming Chen; Zuhai Cheng; Haihong Zhu
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Paper Abstract

Experimental study on laser generating acoustics in water has been performed using high power pulsed CO2 laser. The influences of the laser parameters on the characteristics of the sound pulse, such as amplitude, spectra and peak frequency of the sound pulse, efficiency of the energy conversion were investigated in detail. The results show that the amplitude of the sound pulse increases with the energy exposed to water surface. The efficiency of the optoacoustic energy conversion η is in the range of 0.31×10-6 to 1.65×10-6, and it increases with the laser energy. The spectra have two peaks which are 15.07 kHz and 53.40 kHz, and the sound energy is distributed mainly around 53.40 kHz. The shape of the spectra is not variable with the laser energy, but the pressure of the peaks increases with deposited laser energy. The exciting mechanism of laser acoustic in this experiment is the combination of thermoelastic and vaporization.

Paper Details

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 727611 (18 February 2009); doi: 10.1117/12.823826
Show Author Affiliations
Qingming Chen, Huazhong Univ. of Science and Technology (China)
Wuhan Univ. of Science and Technology (China)
Zuhai Cheng, Huazhong Univ. of Science and Technology (China)
Haihong Zhu, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 7276:
Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications
Peixiang Lu; Katsumi Midorikawa; Bernd Wilhelmi, Editor(s)

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