TEMPORAL, SPECTRAL, AND ENERGY CHARACTERISTICS OF THE ACOUSTIC PULSES GENERATED DURING LASER BREAKDOWN ON A SOLID AEROSOL PARTICLE

Results of investigations of the temporal, spectral, and energetic characteristics of the acoustic pulses generated during 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 size of the solid aerosol particle, and the pulse duration at half maximum increases compared to the positive 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 is slowed down due to the threshold character of laser breakdown initiation and evolution.