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<p>Results of investigations of the temporal, spectral, and energetic characteristics of acoustic pulses from laser breakdown on a&#xa0;solid aerosol particle are systematized. It is shown that the acoustic pulse has the form of a&#xa0;shock <i>N</i>-wave, the amplitude of the negative half-period of which decreases with increasing solid aerosol particle size, and the acoustic pulse duration at half maximum of the negative (rarefaction) half-period increases compared to the positive (compression) half-period. When the laser energy density <i>Q</i><sub>L</sub> exceeds 10 J/cm<sup>2</sup>, the acoustic energy <i>W</i><sub>ac</sub> increases exponentially with <i>Q</i><sub>L</sub>. The rate of increase of <i>W</i><sub>ac</sub> slows down due to the threshold character of laser breakdown initiation.</p>

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Temporal, spectral, and energy characteristics of acoustic pulses from laser breakdown on a solid aerosol particle

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • A. I. Potekaev,
  • N. P. Krasnenko,
  • L. G. Shamanaeva

摘要

Results of investigations of the temporal, spectral, and energetic characteristics of acoustic pulses from laser breakdown on a solid aerosol particle are systematized. It is shown that the acoustic pulse has the form of a shock N-wave, the amplitude of the negative half-period of which decreases with increasing solid aerosol particle size, and the acoustic pulse duration at half maximum of the negative (rarefaction) half-period increases compared to the positive (compression) half-period. When the laser energy density QL exceeds 10 J/cm2, the acoustic energy Wac increases exponentially with QL. The rate of increase of Wac slows down due to the threshold character of laser breakdown initiation.