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Proceedings Paper

Optimisation of laser-driven flyer velocity using photonic Doppler velocimetry
Author(s): M. D. Bowden; S. L Knowles
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Paper 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.

Paper Details

Date Published: 28 August 2009
PDF: 11 pages
Proc. SPIE 7434, Optical Technologies for Arming, Safing, Fuzing, and Firing V, 743403 (28 August 2009); doi: 10.1117/12.826246
Show Author Affiliations
M. D. Bowden, Atomic Weapons Establishment (United Kingdom)
S. L Knowles, Atomic Weapons Establishment (United Kingdom)

Published in SPIE Proceedings Vol. 7434:
Optical Technologies for Arming, Safing, Fuzing, and Firing V
Fred M. Dickey; Richard A. Beyer, Editor(s)

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