| Literature DB >> 19907618 |
A J Nelson1, S Toleikis, H Chapman, S Bajt, J Krzywinski, J Chalupsky, L Juha, J Cihelka, V Hajkova, L Vysin, T Burian, M Kozlova, R R Fäustlin, B Nagler, S M Vinko, T Whitcher, T Dzelzainis, O Renner, K Saksl, A R Khorsand, P A Heimann, R Sobierajski, D Klinger, M Jurek, J Pelka, B Iwan, J Andreasson, N Timneanu, M Fajardo, J S Wark, D Riley, T Tschentscher, J Hajdu, R W Lee.
Abstract
We have focused a beam (BL3) of FLASH (Free-electron LASer in Hamburg: lambda = 13.5 nm, pulse length 15 fs, pulse energy 10-40 microJ, 5 Hz) using a fine polished off-axis parabola having a focal length of 270 mm and coated with a Mo/Si multilayer with an initial reflectivity of 67% at 13.5 nm. The OAP was mounted and aligned with a picomotor controlled six-axis gimbal. Beam imprints on poly(methyl methacrylate) - PMMA were used to measure focus and the focused beam was used to create isochoric heating of various slab targets. Results show the focal spot has a diameter of < or =1 microm. Observations were correlated with simulations of best focus to provide further relevant information.Entities:
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Year: 2009 PMID： 19907618 DOI： 10.1364/OE.17.018271
Source DB: PubMed Journal: Opt Express ISSN： 1094-4087 Impact factor: 3.894