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Proceedings Paper

Laser-induced plasmas examined by means of quasi-cinematographic methods
Author(s): Marion Althaus; Manfred Hugenschmidt
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Paper Abstract

A TEA-CO2-mini-Laser (pulse duration 1 microsecond(s) , 200 mJ/pulse) has been used to generate plasmas on the surface of opaque and transparent solids. The power density in the laser focal plane leads to decomposition and vaporization of material and finally to a fast plasma creation. The combined effects of laser induced plasmas and surface ablation generate both shock waves in the ambient atmosphere and high pressure transient acoustic waves in the solid. The processes of plasma ignition and shock wave propagation have been visualized by means of laserdiagnostic techniques such as interferometry or shadowgraphy. The technique used was a quasi-cinematographic sampling method. Therefore a probing laser (repetitively pulsed Nd:YLF-laser, q-switched, frequency-doubled) illuminated the plasma with an adjustable delay to the CO2-pulse. This delay ranged from a few nanoseconds to tens of microseconds. The same method was simultaneously used to observe the shock wave inside the transparent target.

Paper Details

Date Published: 31 March 1995
PDF: 5 pages
Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); doi: 10.1117/12.204894
Show Author Affiliations
Marion Althaus, Deutsch-Franzoesisches Forschungsinstitut (France)
Manfred Hugenschmidt, Deutsch-Franzoesisches Forschungsinstitut (France)


Published in SPIE Proceedings Vol. 2502:
Gas Flow and Chemical Lasers: Tenth International Symposium
Willy L. Bohn; Helmut Huegel, Editor(s)

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