Shock-Wave Generation in Rarefied Gases by Laser Impact on Beryllium Targets
- 1 August 1968
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 39 (9) , 4184-4189
- https://doi.org/10.1063/1.1656945
Abstract
Shock waves in argon and in air have been observed when focusing a 0.8 J, 40 nsec, Q‐switched ruby laser beam onto a beryllium target in the presence of gas at various pressures ranging fron 2×10−1 to 3 Torr. High‐speed streak and framing camera as well as a prism spectrograph have been used as diagnostic tools. Space‐resolved spectra show, besides an intense continuum, Stark‐broadened lines from Be I and Be II. The reinforced argon lines when moving off the Be target surface are probably due to a shock wave driven by the Be plasma acting as a piston. A simple theoretical model taking this mechanism into account is proposed. Calculated curves for the outer radius variations of the shock front fit closely the experimental results.This publication has 9 references indexed in Scilit:
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