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

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