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Proceedings Paper

Ultrafast laser-induced plasma diagnostics with time-spatial-resolved shadow and interferometric techniques
Author(s): Serge V. Garnov; Alexander A. Malyutin; Olga G. Tsarkova; Vitali I. Konov; Friedrich Dausinger
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Paper Abstract

The experimental studies of laser-induced plasma accompanying the laser ablation of material have been conducted with the developed shadow-interferometric technique. High intensity single picosecond pulses of YAP:Nd laser were applied to ablate tested samples and time-delayed probing pulses of second harmonic illuminating the interaction area were used to make snap-shots of the expanded plasma plume. Both shadow and interferometric images of hot plasma were captured simultaneously with a CCD camera providing approximately equals 1.5 micron spatial and approximately equals 10 ps temporal resolution of the investigated processes. By varying the intensity of ablating pulses and the time-delay of probing pulses it was possible to study a highly inhomogeneous small-scaled plasma density and refractive index distribution within the plume. The longer time-delays allowed study of laser-initiated shock wave expansion in the surrounding atmosphere. A special attention was paid to the plasma formation arising at a through-hole laser drilling process was observed. In particular, it was shown that the cluster explosion can efficiently block the laser radiation resulting in decreasing the ablation rate. A computer modeling of optical visualization of small-scale plasma objects has been conducted. The analysis si of the experimental and numerical results has revealed a number of characteristic features of plasma images that should be taken into account at the qualitative and quantitative evaluations of the plasma parameters.

Paper Details

Date Published: 18 June 2002
PDF: 12 pages
Proc. SPIE 4637, Photon Processing in Microelectronics and Photonics, (18 June 2002); doi: 10.1117/12.470643
Show Author Affiliations
Serge V. Garnov, General Physics Institute (Russia)
Alexander A. Malyutin, General Physics Institute (Russia)
Olga G. Tsarkova, General Physics Institute (Russia)
Vitali I. Konov, General Physics Institute (Russia)
Friedrich Dausinger, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 4637:
Photon Processing in Microelectronics and Photonics
Jan J. Dubowski; Willem Hoving; Koji Sugioka; Malcolm C. Gower; Richard F. Haglund; Alberto Pique; Frank Traeger; Jan J. Dubowski; Willem Hoving, Editor(s)

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