Strength properties of an aluminum melt at extremely high tension rates under the action of femtosecond laser pulses

Two-temperature hydrodynamics of laser-generated ultrashort shock waves in elasto-plastic solids

“…This resolution is ∼ 0.1 ps for fs device [2,3] and few ps for sub-ns devices [5,6]. It overcomes by 3-4 orders of magnitudes the resolution of both the velocity interferometer system for any reflector (VISAR) and the optically recording velocity interferometer system (ORVIS).…”

“…For such metals as aluminum, nickel, and so on, the usual values of HEL are small -this means that an elastic shock wave (SW) driven by piston at a stress near HEL has velocity D el only 1 − 2% higher than elastic sound speed c el . Until recently, before works [2][3][4][5][6], the elastic branch of Hugoniot was widely accepted as a linear function for stresses below the common HEL. This is why a strong elastic SW firstly observed in the excellent pump-probe experiments with femtosecond lasers done by Evans et al [7] and Gahagan et al [8] was not recognized as an elastic wave.…”

“…Colliding plates and nanosecond (ns) lasers now are routinely applied for generation of SW [11,12]. There are recent experiments on laser shock generation based on femtosecond (fs) [2,3] and subnanosecond (sub-ns) [5,6] pulses. They open new direction in physics of SW. Simulations [2,4,9,10] allow to understand the internal events caused by fs and sub-ns pulses inside the irradiated target and to demonstrate a superelastic nature of a generated SW (calculation results on sub-ns case remain unpublished).…”

“…They open new direction in physics of SW. Simulations [2,4,9,10] allow to understand the internal events caused by fs and sub-ns pulses inside the irradiated target and to demonstrate a superelastic nature of a generated SW (calculation results on sub-ns case remain unpublished). Experiments [2,3,5,6] and simulations [2,4,9,10] (i) reveal that uniaxially compressed lattice survives under huge stresses, (ii) describe elastic branches 1 of Hugoniot adiabats at high volume compressions and pressures, and (iii) discover the dynamic coupling of elastic and plastic SW [10]. This interaction supports propagation of an elastic SW ahead very strong plastic one.…”

“…The main advantages of laser-induced shock-wave experiments [2,3,5,6] are (i) synchronization between a pump pulse driving SW and probe pulse following dynamics of expansion of a rearside surface after arrival of SW; and (ii) high temporal resolution of probing. This resolution is ∼ 0.1 ps for fs device [2,3] and few ps for sub-ns devices [5,6].…”