Laser-induced plasmas examined by means of quasi-cinematographic methods

Marion Althaus; Manfred Hugenschmidt

doi:10.1117/12.204894

31 March 1995 Laser-induced plasmas examined by means of quasi-cinematographic methods

Marion Althaus, Manfred Hugenschmidt

Proceedings Volume 2502, Gas Flow and Chemical Lasers: Tenth International Symposium; (1995) https://doi.org/10.1117/12.204894
Event: Gas Flow and Chemical Lasers: Tenth International Symposium, 1994, Friedrichshafen, Germany

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.

Citation Download Citation

Marion Althaus and Manfred Hugenschmidt "Laser-induced plasmas examined by means of quasi-cinematographic methods", Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); https://doi.org/10.1117/12.204894

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