Spectral and temporal characteristics of target current and electromagnetic pulse induced by nanosecond laser ablation

0478416 - FZÚ 2018 RIV GB eng J - Journal Article
Krása, Josef - De Marco, Massimo - Cikhardt, Jakub - Pfeifer, Miroslav - Velyhan, Andriy - Klír, Daniel - Řezáč, Karel - Limpouch, J. - Krouský, Eduard - Dostál, Jan - Ullschmied, Jiří - Dudžák, Roman
Spectral and temporal characteristics of target current and electromagnetic pulse induced by nanosecond laser ablation.
Plasma Physics and Controlled Fusion. Roč. 59, č. 6 (2017), 1-8, č. článku 065007. ISSN 0741-3335. E-ISSN 1361-6587
R&D Projects: GA MŠMT EF15_008/0000162; GA ČR GA16-07036S
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Grant - others:ELI Beamlines(XE) CZ.02.1.01/0.0/0.0/15_008/0000162
Institutional support: RVO:68378271 ; RVO:61389021
Keywords : laser-produced plasma * target current * electromagnetic pulse
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.032, year: 2017

The current balancing the target charging and the emission of transient electromagnetic pulses (EMP) driven by the interaction of a focused 1.315 mu m iodine 300 ps PALS laser with metallic and plastic targets were measured with the use of inductive probes. It is experimentally proven that the duration of return target currents and EMPs is much longer than the duration of laser-target interaction. The laser-produced plasma is active after the laser-target interaction. During this phase, the target acts as a virtual cathode and the plasma-target interface expands. A double exponential function is used in order to obtain the temporal characteristics of EMP. The rise time of EMPs fluctuates in the range up to a few tens of nanoseconds. Frequency spectra of EMP and target currents are modified by resonant frequencies of the interaction chamber.
Permanent Link: http://hdl.handle.net/11104/0274535