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Proceedings Paper

Investigation Of Pulsed Laser Target Interaction Processes By High-Speed Diagnostic Techniques
Author(s): Manfred Hugenschmidt
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Paper Abstract

The application of laser power densities above the plasma ignition threshold to any dielectric, semiconducting or metallic target material is capable of providing a most efficient energy transfer by an enhanced coupling mechanism. The present paper is concerned with experimental investigations of pulsed laser target interaction phenomena in a medium power density range below air breakdown threshold. When infrared lasers are considered, these values are in the range of some hundreds of MW/cm2 or even below, for UV-lasers these values may be higher by one or two orders of magnitude. This range is of particular interest, as plasma induced thermo-mechanical processes are governing and improving the energy transfer. Many of the processes involved have been investigated for single pulse operation. The most interesting features are occurring, however, if trains of pulses are applied, thereby building up high average power densities so that target effects are integrated. temporally. These effects are then increasing rapidly giving rise to fast heating, melting, vaporization and subsequent ablation, including thermally induced chemical reactions. The paper gives an overview on current research in the above mentioned field and describes recent measurements performed at the ISL Saint-Louis. Main emphasis is layed on discussing the various types of fast electrical and optical diagnostic principles and techniques used for the optimization of the energy transfer rates at this particular high average power density range.

Paper Details

Date Published: 7 June 1989
PDF: 10 pages
Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); doi: 10.1117/12.969073
Show Author Affiliations
Manfred Hugenschmidt, Franco-German Research Institute of Saint-Louis (United States)

Published in SPIE Proceedings Vol. 1032:
18th Intl Congress on High Speed Photography and Photonics
DaHeng Wang, Editor(s)

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