Evolution of the hot channel and blast wave structure generated from femtosecond tagging in quiescent air
2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. The radial dynamics of hot channels generated from femtosecond laser breakdown in quiescent air are studied numerically. The evolution of the hot channel width is normalized by scaling quantities which allow us to account for the variations in ambient conditions, focal zone geometry and deposited energy in each simulation. The normalized curves collapse onto a single curve referred to as the universal or general solution. General solutions describing the evolution of the fluid variables (density, pressure and temperature) along the laser axis are also found. Approximations of the maximum hot channel width given in literature are compared to measurements obtained from the simulations.
name of conference
2018 Aerodynamic Measurement Technology and Ground Testing Conference