Studying the dynamics of wave processes of compression and expansion in palladium under picosecond laser action

The processes in a flat palladium target irradiated with an intense picosecond laser pulse are studied. In the experiment, the parameters of the irradiating pulse, as well as the depth of the spall cavity formed as a result of the complex flow of compression and expansion waves through the substance are determined. The interaction dynamics of these waves are modeled using a new equation of state for palladium over a wide range of densities and pressures. Based on the results of the experiment and numerical simulation, the maximum tensile stress in the spall plane at a high tensile rate is estimated.