Impact of laser time structure on the evolution behavior of laser induced plasma and stress waves in the target

This study investigates the impact of laser time structure on laser-induced plasma plume evolution and shock wave propagation within target. The theoretical analysis of plasma plume dynamics under various pulse rise times were carried by HELIOS code. An experimental setup incorporating spontaneous emission fast photography and time-resolved interferometry was developed to observe plasma dynamics and monitor the distribution of shock stresses at different stages. The results indicate that, under energy-limited conditions, short-rise-time pulses yield higher peak shock pressures, whereas long-rise-time pulses lead to elevated electron temperatures. By adjusting the laser time structure, effective control over both shock pressure and electron temperature can be achieved. This research provides valuable insights for optimizing laser parameters in applications such as laser shock peening and laser-induced breakdown spectroscopy.