Laser acoustics in water induced by high power CO2 pulsed laser

Qingming Chen; Zuhai Cheng; Haihong Zhu

doi:10.1117/12.823826

18 February 2009 Laser acoustics in water induced by high power CO₂ pulsed laser

Qingming Chen, Zuhai Cheng, Haihong Zhu

Proceedings Volume 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications; 727611 (2009) https://doi.org/10.1117/12.823826
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

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.

Citation Download Citation

Qingming Chen, Zuhai Cheng, and Haihong Zhu "Laser acoustics in water induced by high power CO₂ pulsed laser", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 727611 (18 February 2009); https://doi.org/10.1117/12.823826

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