Fluence scan: an unexplored property of a laser beam

0398687 - FZÚ 2014 RIV US eng J - Journal Article
Chalupský, Jaromír - Burian, Tomáš - Hájková, Věra - Juha, Libor - Polcar, T. - Gaudin, J. - Nagasono, M. - Sobierajski, R. - Yabashi, M. - Krzywinski, J.
Fluence scan: an unexplored property of a laser beam.
Optics Express. Roč. 21, č. 22 (2013), s. 26363-26375. ISSN 1094-4087
R&D Projects: GA ČR(CZ) GAP108/11/1312; GA ČR GA13-28721S; GA MŠMT(CZ) LG13029; GA ČR GAP208/10/2302; GA ČR GAP205/11/0571; GA MŠMT EE2.3.30.0057
Grant - others:AVČR(CZ) M100101221; OP VK 4 POSTDOK(XE) CZ.1.07/2.3.00/30.0057
Institutional support: RVO:68378271
Keywords : free-electron lasers (FELs) * UV * EUV * x-ray lasers * laser beam characterization * F-scan
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.525, year: 2013

We present an extended theoretical background of so-called fluence scan method, which is frequently being used for offline characterization of focused short-wavelength (EUV, X-ray) laser beams. The method exploits ablative imprints in various solids to visualize iso-fluence beam contours at different fluence and/or clip levels. An f-scan curve can be generated for a general non-Gaussian beam. As shown, f-scan encompasses important information about energy distribution within the beam profile, which may play an essential role in laser-matter interaction research employing intense non-ideal beams. We for the first time discuss fundamental properties of the f-scan function and its inverse counterpart. We extensively elucidate how it is related to the effective beam area, energy distribution, and to the so called Liu’s dependence. A new method of the effective area evaluation based on weighted inverse f-scan fit is introduced and applied to real data obtained at the SCSS facility.
Permanent Link: http://hdl.handle.net/11104/0226122