Investigation Of Pulsed Laser Target Interaction Processes By High-Speed Diagnostic Techniques

Manfred Hugenschmidt

doi:10.1117/12.969073

7 June 1989 Investigation Of Pulsed Laser Target Interaction Processes By High-Speed Diagnostic Techniques

Manfred Hugenschmidt

Proceedings Volume 1032, 18th Intl Congress on High Speed Photography and Photonics; (1989) https://doi.org/10.1117/12.969073
Event: 18th International Congress on High Speed Photography and Photonics, 1988, Xi'an, Shaanxi, China

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.

Citation Download Citation

Manfred Hugenschmidt "Investigation Of Pulsed Laser Target Interaction Processes By High-Speed Diagnostic Techniques", Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); https://doi.org/10.1117/12.969073

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KEYWORDS

Pulsed laser operation

Plasma

Laser processing

Cameras

Absorption

Diagnostics

High speed photography

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