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Reflection of femtosecond pulses from soft X‐ray free‐electron laser by periodical multilayers
Author(s) -
Ksenzov D.,
Grigorian S.,
Hendel S.,
Bienert F.,
Sacher M. D.,
Heinzmann U.,
Pietsch U.
Publication year - 2009
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200881585
Subject(s) - femtosecond , laser , optics , free electron laser , photon energy , reflection (computer programming) , physics , free electron model , pulse (music) , electron , photon , undulator , materials science , range (aeronautics) , atomic physics , detector , nuclear physics , computer science , composite material , programming language
Recent experiments on a soft X‐ray free‐electron laser (FEL) source (FLASH in Hamburg) have shown that multilayers (MLs) can be used as optical elements for highly intense X‐ray irradiation. An effort to find most appropriate MLs has to consider the femtosecond time structure and the particular photon energy of the FEL. In this paper we have analysed the time response of ‘low absorbing’ MLs (e.g. such as La/B 4 C) as a function of the number of periods. Interaction of a pulse train of Gaussian shaped sub‐pulses using a realistic ML grown by electron‐beam evaporation technique has been analysed in the soft‐X‐ray range. The structural parameters of the MLs were obtained by reflectivity measurements at BESSY II and subsequent profile fittings.