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Laser‐based, high repetition rate, ultrafast X‐ray source
Author(s) -
Kutzner Jörg,
Witte Henrik,
Silies Martin,
Haarlammert Thorben,
Hüve Jana,
Tsilimis Grigorios,
Uschmann Ingo,
Förster Eckhart,
Zacharias Helmut
Publication year - 2006
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2340
Subject(s) - bremsstrahlung , laser , ultrashort pulse , optics , x ray , photon , radiation , photon energy , range (aeronautics) , bent molecular geometry , materials science , chemistry , atomic physics , physics , composite material
A compact, ultrashort, laser‐based hard X‐ray source particularly suited for high repetition rate laser systems (≥1 kHz) is presented. X rays in the keV energy range are generated efficiently with 30 fs laser pulses on different tape targets containing chromium and iron. Spectroscopic investigations showed that for the chromium as well as for the iron tapes, strong Kα and Kβ emission were observed in addition to a weak bremsstrahlung continuum. These tape targets are especially suited for applications in a transmission geometry, which provides significant advantages. The operation of the tape target was studied with repetition rates up to 10 kHz. With input pulses of 0.5 mJ and modest intensities in the low 10 15 W/cm 2 range, X‐ray Kα photon fluxes exceeding 6 × 10 9 photons/s were achieved, yielding conversion efficiencies of η Kα > 10 −6 . With a toroidally bent crystal the generated radiation was monochromatized and focused to a 85‐µm diameter spot demonstrating the ability of the source to act as a X‐ray point source, a pre‐requisite for an application in X‐ray microscopy. Copyright © 2006 John Wiley & Sons, Ltd.