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497 results on '"Fiedorowicz H"'

11. Compact NEXAFS System Based on Laser-Plasma Soft X-ray Light Source for the Analysis of Barium Edges in a B+BaF2 Optical Filter.

Author

FOK, T., WACHULAK, P., WARDZINSKA, M., BARTNIK, A., NYGA, P., NOWAK, M. P., and FIEDOROWICZ, H.

Subjects
BARIUM fluoride, X-ray absorption near edge structure, SOFT X rays, LIGHT filters, LIGHT sources, BARIUM, DIFFRACTION gratings, RADIATION absorption
Abstract

In this work, we present the results of the analysis performed with near edge absorption fine structure spectroscopy of barium edges in a B+BaF2 optical filter. The radiation was generated by a laser-plasma soft X-ray source based on a double-stream gas puff target. The use of a flat-field spectrometer based on a diffraction grating allowed us to collect the absorption spectra of the radiation transmitted by the analyzed optical filter. The results demonstrate the appearance of clear M-edges of barium (M4 and M5). [ABSTRACT FROM AUTHOR]

Published
2024
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19. Nanoexplosion initiated by short-wavelength radiation: Optical breakdown in soft matter revisited.

Author

Janulewicz, K. A., Jach, K., Świerczyński, R., Bartnik, A., Kostecki, J., Wachulak, P., Fiedorowicz, H., and Kim, C. M.

Subjects
RADIATION, LASER beams, MATTER, DE-Broglie waves, DUST explosions, MATERIAL plasticity, SOFT X rays
Abstract

The term "laser microexplosion" has been introduced to stress the violent character of the optical breakdown by laser radiation under conditions of tight focusing. Generally, the starting phase of the breakdown has been neglected by the assumption of absorption triggered by the presence of damage precursors. The application of the plasticity–elasticity theory in the analysis of the dynamics of this phenomenon has not been extensively examined to date. This paper formulates a phenomenological model attempting to explain the creation of nanovoids in a soft matter under irradiation by a flux of extreme ultraviolet (XUV)/soft x-ray photons. The combined action of plastic deformation and dissociation waves on soft matter is found to be responsible for the material modifications. It is suggested that localized (volume ≃ λ 3) abundance of energy, coming most likely from photon bunching, constitutes the real onset of the photo-ablative decomposition. It is shown that the coincidental presence of some small number of energy carriers (2–3 XUV photons in the considered case) in such a small volume triggers processes denoted from now on as a laser nanoexplosion. The effect is considered to be the first step in the optical breakdown followed by an intense material removal resembling, to some extent, a phase explosion. [ABSTRACT FROM AUTHOR]

Published
2020
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20. Overview of Tabletop X-Ray Laser Development at the Lawrence Livermore National Laboratory

Author

Dunn, J., Shlyaptsev, V. N., Nilsen, J., Smith, R. F., Keenan, R., Moon, S. J., Filevich, J., Rocca, J., Nelson, A. J., Hunter, J. R., MarconiS, M. c., Li, L., Osterheld, A. L., Shepherd, R., Fiedorowicz, H., Bartnik, A., Faenov, A. Ya., Pikuz, T.A., Zeitoun, P., Hubert, S., Jacquemot, S., Fajardo, M., Nickles, P.V., editor, and Janulewicz, K.A., editor

Published
2007
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