Photoacoustic generation of focused quasi-unipolar pressure pulses

Konstantin Maslov, Hao F. Zhang, Lihong V. Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The photoacoustic effect was employed to generate short-duration quasi-unipolar acoustic pressure pulses in both planar and spherically focused geometries. In the focal region, the temporal profile of a pressure pulse can be approximated by the first derivative of the temporal profile near the front transducer surface, with a time-averaged value equal to zero. This approximation agreed with experimental results acquired from photoacoustic transducers with both rigid and free boundaries. For a free boundary, the acoustic pressure in the focal region is equal to the sum of a positive pressure that follows the spatial profile of the optical energy deposition in the medium and a negative pressure that follows the temporal profile of the laser pulse.

Original languageEnglish (US)
Pages (from-to)247-253
Number of pages7
JournalJournal of Innovative Optical Health Sciences
Issue number4
StatePublished - Oct 2010


  • Photoacoustics
  • optoacoustics
  • ultrasound generation
  • unipolar pulse

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Medicine (miscellaneous)
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering


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