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Self-focusing effect in Au-target induced by high power pulsed laser at PALS

Published online by Cambridge University Press:  30 June 2008

L. Torrisi ,
D. Margarone ,
L. Laska ,
J. Krasa ,
A. Velyhan ,
M. Pfeifer ,
J. Ullschmied  and
L. Ryc
L. Torrisi*
Affiliation:
Dipartimento di Fisica, Università di Messina, Messina, Italy INFN-Laboratori Nazionali del Sud, Catania, Italy
D. Margarone
Affiliation:
Dipartimento di Fisica, Università di Messina, Messina, Italy INFN-Laboratori Nazionali del Sud, Catania, Italy
L. Laska
Affiliation:
Institute of Physics, ASCR, Prague, Czech Republic
J. Krasa
Affiliation:
Institute of Physics, ASCR, Prague, Czech Republic
A. Velyhan
Affiliation:
Institute of Physics, ASCR, Prague, Czech Republic
M. Pfeifer
Affiliation:
Institute of Physics, ASCR, Prague, Czech Republic
J. Ullschmied
Affiliation:
Institute of Physics, ASCR, Prague, Czech Republic
L. Ryc
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
*
Address correspondence and reprint requests to: L. Torrisi, INFN-Laboratori Nazionali del Sud, Via S. Sofia 62, 95125 Catania, Italy. E-mail: torrisi@lns.infn.it
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Abstract

Self-focusing effects, induced by ASTERIX pulsed laser at PALS Laboratory of Prague, have been investigated. Laser was employed at the third harmonics (438 nm) and intensities of the order of 1016 W/cm2. Pure Au was used as thin target and irradiated with 30° incidence angle. An ion energy analyzer was employed to detect the energy-to-mass ratio of emitted ions from plasma. Measurements were performed by changing the focal point position with a high spatial resolution step-motor. Results demonstrated that non linear processes, due to self-focusing effects, occurs when the laser beam is focused at about 200 µm in front of the target surface. In such conditions, a new ion group, having high charge state and kinetic energy, is produced because of the increment in temperature of the laser-generated plasma.

Keywords

Laser focalizationLaser-generated plasmaPlasma temperaturePlasma densitySelf-focusing
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 379 - 387
Copyright
Copyright © Cambridge University Press 2008

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