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Target current: a useful parameter for characterizing laser ablation

Published online by Cambridge University Press:  13 February 2017

J. Krása ,
E. Giuffreda ,
D. Delle Side ,
V. Nassisi ,
D. Klír ,
J. Cikhardt  and
K. Řezáč
J. Krása*
Affiliation:
Institute of Physics, CAS, Prague, Czech Republic
E. Giuffreda
Affiliation:
Dipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, Lecce, Italy INFN, Sezione di Lecce, Italy
D. Delle Side
Affiliation:
Dipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, Lecce, Italy INFN, Sezione di Lecce, Italy
V. Nassisi
Affiliation:
Dipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, Lecce, Italy INFN, Sezione di Lecce, Italy
D. Klír
Affiliation:
Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic Institute of Plasma Physics, CAS, Prague, Czech Republic
J. Cikhardt
Affiliation:
Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic Institute of Plasma Physics, CAS, Prague, Czech Republic
K. Řezáč
Affiliation:
Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic Institute of Plasma Physics, CAS, Prague, Czech Republic
*
*Address correspondence and reprint requests to: J. Krása, Institute of Physics, CAS, Prague, Czech Republic. E-mail: krasa@fzu.cz
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Abstract

A current flowing between the ground and target exposed to the nanosecond laser radiation is analyzed to complete characteristics of laser ablation. Three phases of the target current are distinguished. During the ignition phase, the electron emission is driven by the laser pulse and the positive charge generated on the target is balanced by electrons coming from the ground through the target holder. At post-pulse times, a peaked waveform of the target current is typical for the active phase of the plasma and can give information on the material composition of the ablated surface layers. The afterglow phase is determined by a current of electrons flowing from the target to the ground. Experiment shows that the time-resolved target current is very sensitive to the actual composition of the surface layer of irradiated target and laser parameters.

Keywords

Impurities on target surfacePositive and negative target polarizationSpace structure of ion frontTarget current in laser-produced plasmas
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 1 , March 2017 , pp. 170 - 176
Copyright
Copyright © Cambridge University Press 2017 

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