Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 12: Anwendung ultrakurzer Lichtimpulse I
Q 12.4: Vortrag
Samstag, 5. März 2005, 09:15–09:30, HU 1070
Compact, monochromatic femtosecond laser-based x-ray source with small spot size — •H. Witte1, M. Silies1, G. Tsilimis1, J. Kutzner1, I. Uschmann2, E. Förster2, and H. Zacharias1 — 1Physikalisches Institut, WWU Münster — 2Institut für Optik and Quantenelektronik, FSU Jena
We present a compact and UHV compatible x-ray source based on a tape target and a focussing single crystal monochromator. 1 kHz, 25 fs Ti:sapphire laser pulses with sub-millijoule pulse energy are applied to commercially available audio cassette tapes. More than 108 CrKα photons/s are generated in 4 π. The x-ray radiation is refocused and monochromatized by a toroidally bent Si (311) crystal. A x-ray spot diameter of 80 µm is reached so far with the potential of substantially reducing the spot size by improving the focussing conditions of the generating laser radiation. A x-ray photon flux of 103 CrKα1 photons/s is achieved in the focus region. The Bragg crystal was used to characterize the emitted x-ray spectrum in the vicinity of the CrKα lines and the CrKα1 and CrKα2 line could clearly be resolved.