Ultrafast laser-induced plasma diagnostics with time-spatial-resolved shadow and interferometric techniques

Serge V. Garnov; Alexander A. Malyutin; Olga G. Tsarkova; Vitali I. Konov; Friedrich Dausinger

doi:10.1117/12.470643

18 June 2002 Ultrafast laser-induced plasma diagnostics with time-spatial-resolved shadow and interferometric techniques

Serge V. Garnov, Alexander A. Malyutin, Olga G. Tsarkova, Vitali I. Konov, Friedrich Dausinger

Author Affiliations +

Proceedings Volume 4637, Photon Processing in Microelectronics and Photonics; (2002) https://doi.org/10.1117/12.470643
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

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.

Citation Download Citation

Serge V. Garnov, Alexander A. Malyutin, Olga G. Tsarkova, Vitali I. Konov, and Friedrich Dausinger "Ultrafast laser-induced plasma diagnostics with time-spatial-resolved shadow and interferometric techniques", Proc. SPIE 4637, Photon Processing in Microelectronics and Photonics, (18 June 2002); https://doi.org/10.1117/12.470643

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