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Focusing of shock waves induced by optical breakdown in water.

Publication ,  Journal Article
Sankin, GN; Zhou, Y; Zhong, P
Published in: The Journal of the Acoustical Society of America
June 2008

The focusing of laser-generated shock waves by a truncated ellipsoidal reflector was experimentally and numerically investigated. Pressure waveform and distribution around the first (F(1)) and second foci (F(2)) of the ellipsoidal reflector were measured. A neodymium doped yttrium aluminum garnet laser of 1046 nm wavelength and 5 ns pulse duration was used to create an optical breakdown at F(1), which generates a spherically diverging shock wave with a peak pressure of 2.1-5.9 MPa at 1.1 mm stand-off distance and a pulse width at half maximum of 36-65 ns. Upon reflection, a converging shock wave is produced which, upon arriving at F(2), has a leading compressive wave with a peak pressure of 26 MPa and a zero-crossing pulse duration of 0.1 mus, followed by a trailing tensile wave of -3.3 MPa peak pressure and 0.2 mus pulse duration. The -6 dB beam size of the focused shock wave field is 1.6 x 0.2 mm(2) along and transverse to the shock wave propagation direction. Formation of elongated plasmas at high laser energy levels limits the increase in the peak pressure at F(2). General features in the waveform profile of the converging shock wave are in qualitative agreement with numerical simulations based on the Hamilton model.

Duke Scholars

Published In

The Journal of the Acoustical Society of America

DOI

EISSN

1520-8524

ISSN

0001-4966

Publication Date

June 2008

Volume

123

Issue

6

Start / End Page

4071 / 4081

Related Subject Headings

  • Water
  • Pressure
  • Models, Theoretical
  • Microbubbles
  • Lithotripsy
  • Lasers
  • High-Energy Shock Waves
  • Equipment Design
  • Acoustics
  • Acoustics
 

Citation

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Sankin, G. N., Zhou, Y., & Zhong, P. (2008). Focusing of shock waves induced by optical breakdown in water. The Journal of the Acoustical Society of America, 123(6), 4071–4081. https://doi.org/10.1121/1.2903865
Sankin, Georgy N., Yufeng Zhou, and Pei Zhong. “Focusing of shock waves induced by optical breakdown in water.The Journal of the Acoustical Society of America 123, no. 6 (June 2008): 4071–81. https://doi.org/10.1121/1.2903865.
Sankin GN, Zhou Y, Zhong P. Focusing of shock waves induced by optical breakdown in water. The Journal of the Acoustical Society of America. 2008 Jun;123(6):4071–81.
Sankin, Georgy N., et al. “Focusing of shock waves induced by optical breakdown in water.The Journal of the Acoustical Society of America, vol. 123, no. 6, June 2008, pp. 4071–81. Epmc, doi:10.1121/1.2903865.
Sankin GN, Zhou Y, Zhong P. Focusing of shock waves induced by optical breakdown in water. The Journal of the Acoustical Society of America. 2008 Jun;123(6):4071–4081.

Published In

The Journal of the Acoustical Society of America

DOI

EISSN

1520-8524

ISSN

0001-4966

Publication Date

June 2008

Volume

123

Issue

6

Start / End Page

4071 / 4081

Related Subject Headings

  • Water
  • Pressure
  • Models, Theoretical
  • Microbubbles
  • Lithotripsy
  • Lasers
  • High-Energy Shock Waves
  • Equipment Design
  • Acoustics
  • Acoustics