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Proceedings Paper

High-speed photonic diagnostics of laser-target energy conversion processes
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Paper Abstract

In pulsed power technology high energy densities are generated either mechanically, electrically, magnetically, chemically or optically. Particularly interesting processes are met if energies are supplied by high power laser radiation. Lasers, however, are not only useful for inducing and controlling target effects, they also provide advanced tools for diagnostics, suited to the study of fast, even explosively developing events. According to present ISL activities, optical components (subject to radiation power densities up to the atmospheric propagation limit) are studied. Experiments, yielding data on thermodynamic parameters, refer to studies of the energy balance and conversion efficiencies from which further information is obtained on phase changes, ionization, etc. Additionally, the visualization of such processes allows to check theoretical models and numerical simulations. The combination of illuminating laser and CCD-cameras provides digital image formats with exciting capabilities of numerical image processing. For the investigation of specific effects, such as those induced by repetitively pulsed lasers, an optical laser sampling technique was developed, which (for quantitative evaluation) allows to convert fast supersonic motion into quasi-stationary slow motion. This was achieved by conventional low-cost videographic equipment. The characterization of laser-ablation-induced optical parameter changes was achieved by determining the modulation transfer function. A comprehensive overview of current coherent optical measurement techniques will be given and trends will be outlined.

Paper Details

Date Published: 17 April 2001
PDF: 15 pages
Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424306
Show Author Affiliations
Manfred Hugenschmidt, German-French Research Institute of Saint-Louis (France)

Published in SPIE Proceedings Vol. 4183:
24th International Congress on High-Speed Photography and Photonics
Kazuyoshi Takayama; Tsutomo Saito; Harald Kleine; Eugene V. Timofeev, Editor(s)

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