Interferometric investigations of dynamics and parameters of plasma created by Ti:Sa femtosecond laser.

0482818 - ÚFP 2018 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Kalinowska, Z. - Pisarczyk, T. - Chodukowski, T. - Rosinski, M. - Zaras-Szydlowska, A. - Dudžák, Roman - Dostál, Jan - Borodziuk, S.
Interferometric investigations of dynamics and parameters of plasma created by Ti:Sa femtosecond laser.
EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P4.224. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07.
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]
Institucionální podpora: RVO:61389021
Klíčová slova: laser * plasma
Obor OECD: Fluids and plasma physics (including surface physics)

This contribution presents the first interferometric measurements of laser–produced plasma generated by the Ti:Sa high power laser (10 TW) installed in IPPLM (Institute of Plasma Physics and Laser Microfusion). The aim of the study was to learn the character of the plasma expansion and ions emission for different irradiation conditions of thin-foil targets. Measurements were carried out for different levels of laser beam intensity in the range of 1016- 1019 W/cm2, which was achieved by varying a focal spot radius, by changing the focus position of the main lens in relation to the target surface. To illustrate the plasma expansion and to obtain information about the space-time changes in the electron density of the plasma stream, the 2-frame folding wave interferometer was used. This interferometer was irradiated by Ti:Sa laser pulse with wavelength of 812 nm and FWHM
of 40 fs, separated from the main laser beam (Fig.1). To obtain space and temporal separation of the diagnostic beams, the polarizing optical delay line was applied, which irradiated the interferometer by 2 laser beams, separated in time, with mutually orthogonal polarizations. Additionally, measurements of ions emission by means of the grid collectors for different focus
position were carried out (Fig.4). The obtained information about the dynamics of the parameters of plasma generated in the
femtosecond regime seems to be very useful in studies of of the proton streams by the TNSA (Target Normal Sheath Acceleration).

Trvalý link: http://hdl.handle.net/11104/0278327