Abstract

Laser-driven flyer plates offer a convenient, laboratory-based method for generating extremely high pressure shocks, in excess of 30 GPa, in a variety of materials. They comprise of one or more thin layers forming a foil, coated onto a transparent substrate. By irradiating the interface between foil and substrate with a moderate-energy, short-duration laser pulse, it is possible to form a flyer plate, which can reach velocities in excess of 5 km/s. These flyer plates have several applications, from micrometeorite simulation to initiation of secondary explosives. The flyer plates considered here have up to four layers: an absorption layer, to absorb the laser energy; an ablation layer, to form a plasma; an insulating layer; and a final, thicker layer that forms the final flyer plates. By careful selection of both layer material and thickness, it is possible to increase the maximum velocity achieved for a given laser pulse energy by increasing the proportion of laser energy coupled into flyer kinetic energy. Photonic Doppler Velocimetry (PDV) is used to measure the flyer velocity.

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