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Proceedings Paper

Repetitively pulsed plasma-enhanced laser-target energy transfer processes
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Paper Abstract

Main emphasis of the laser-target effect investigations to be reported in the present paper was related to characterize and to improve methods for enhancing the energy transfer rates by thermal conduction, radiation, recombination or recondensation. It was especially aimed to study the behavior of optically transparent dielectrical materials, subject to temporally strongly modulated high average power laser radiation. Experimental studies were carried out on samples either transparent in the visible or in the infrared spectral range. A large range of laser irradiation conditions was provided by a novel repetitively pulsed CO2-laser. This laser provides average powers up to 15 kW. Pulse energies up to 150 J per pulse and peak powers close to hundred MW (for typical pulse durations of 2 microseconds to 10 microseconds) are achieved at any repetition rate up to 100 pps. Rather uniform power densities (with peak to average values ratios of 103 to 104) were established across large area surfaces quasi-one-dimensionally. Focusing conditions were adapted to specific experimental requirements. High speed photographic diagnostics including high speed videography, laser interferometry and laser moire techniques have been used and compared to provide information on thermal and thermomechanical plasma-induced processes, on damage thresholds and on basic physical mechanisms involved.

Paper Details

Date Published: 22 June 1999
PDF: 10 pages
Proc. SPIE 3516, 23rd International Congress on High-Speed Photography and Photonics, (22 June 1999); doi: 10.1117/12.350511
Show Author Affiliations
Manfred Hugenschmidt, German-French Research Institute Saint-Louis (France)

Published in SPIE Proceedings Vol. 3516:
23rd International Congress on High-Speed Photography and Photonics
Valentina P. Degtyareva; Mikhail A. Monastyrski; Mikhail Ya. Schelev; Alexander V. Smirnov, Editor(s)

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