Speaker
Dr
Denis Vikhlyaev
(Russian Federal Nuclear Center - VNIITF)
Description
Hot plasma is formed at irradiation of matter by high intensity laser radiation with ultrashort pulse duration. This plasma is a bright source of continuous and characteristic x-ray radiation. Due to short luminescence time (~10 ps) and micrometer size of luminescence region (~10 um), such sources are applied in different sciences [1-3].
At a picosecond laser facility, experiments were conducted aimed at exploration of soft x ray yield (in the photon energy range of 0.6-4.5 keV) at laser pulse intensities I~10^17 - 10^19 W/cm^2 from Al, Cu, Mo, W and Pb targets. These experiments allowed to define dependence of electron temperature on laser pulse intensity and dependence of laser pulse energy conversion efficiency into soft x-rays from atomic number of target material. Plasma electron temperature rises from 0.4 keV to 0.6 keV with intensity increase from 10^17 to 10^19 W/cm^2. Conversion efficiency of laser radiation into x-rays changes from 0.5*10^(-3) to 1,5*10^(-3) 1/sr for Al and Pb targets respectively.
Литература
1. Gibbon P. Short pulse laser interaction with matter // World Scientific Pub Co Inc, 2005.
2. Tzortzakis S. Time- and space-resolved X-ray absorption spectroscopy of aluminum irradiated by a subpicosecond high-power laser / S. Tzortzakis, P. Audebert, P. Renaudi, et al.// Journal of Spectroscopy & Radiative Transfer. – 2006. – Vol. 99. – P. 614-626.
3. Kinoshita H. Soft x-ray reduction lithography using multilayer mirrors / H. Kinoshita, K. Kurihara, Y. Ishii, Y. Torii // J. Vac. Sci. Technol. B. – 1989. – Vol. 7. –
P. 1648-1651.
Primary author
Dr
Denis Vikhlyaev
(Russian Federal Nuclear Center - VNIITF)
Co-author
Mr
Pavel Tolstoukhov
(RFNC-VNIITF)
