Target current: an appropriate parameter for characterizing the dynamics of laser-matter interaction

Josef Krása; Daniel KlÍr; Karel Řezáč; Jakub Cikhardt; Andriy Velyhan; Miroslav Pfeifer; Jan Dostál; Miroslav Krůs; Roman Dudžák; Simona Buryšková; Vincenso Nassisi; Domenico Delle Side

doi:10.1117/12.2520177

3 January 2019 Target current: an appropriate parameter for characterizing the dynamics of laser-matter interaction

Josef Krása, Daniel KlÍr, Karel Řezáč, Jakub Cikhardt, Andriy Velyhan, Miroslav Pfeifer, Jan Dostál, Miroslav Krůs, Roman Dudžák, Simona Buryšková, Vincenso Nassisi, Domenico Delle Side

Author Affiliations +

Proceedings Volume 11042, XXII International Symposium on High Power Laser Systems and Applications; 110420X (2019) https://doi.org/10.1117/12.2520177
Event: XXII International Symposium on High Power Laser Systems and Applications, 2018, Frascati, Italy

Abstract

A resistive target probes were employed to obtain unique characteristics of the dynamic of the laser-matter interaction through the observation of a return current neutralizing the positive target charge caused by electrons definitely leaving the plasma. Experimental observations show that three phases of the laser-produced plasma are well recognized, i.e. the plasma ignition phase, active plasma phase, and afterglow phase already for the lowest laser intensity at the focal point of 10⁸ Wcm^-2 . Then, at higher intensities the first two phases strongly dominate and the target current reaches a value of 10 kA. A throughput of plasma barrier for the fastest electrons leaving the plasma is defined, and its value is experimentally estimated. We also present key experiments proving that the duration of the electrical charge on the target is much longer than the duration of the laser-plasma interaction for the entire intensity range.

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Josef Krása, Daniel KlÍr, Karel Řezáč, Jakub Cikhardt, Andriy Velyhan, Miroslav Pfeifer, Jan Dostál, Miroslav Krůs, Roman Dudžák, Simona Buryšková, Vincenso Nassisi, and Domenico Delle Side "Target current: an appropriate parameter for characterizing the dynamics of laser-matter interaction", Proc. SPIE 11042, XXII International Symposium on High Power Laser Systems and Applications, 110420X (3 January 2019); https://doi.org/10.1117/12.2520177

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