Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Ultrakurze Laserpulse: Anwendungen 1
Q 22.10: Talk
Tuesday, March 15, 2011, 12:45–13:00, SCH A01
Monochromatizing a Femtosecond High-Order Harmonic VUV Photon Source with Reflective Off-Axis Zone Plates — •Mateusz Ibek1, Torsten Leitner1, Alexander Firsov2, Alexei Erko2, and Philippe Wernet1 — 1Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin — 2Institute for Nanometer Optics and Technology, Helmholtz-Zentrum Berlin
High-harmonic generation (HHG) of femtosecond lasers pave the way for such applications as table-top imaging and spectroscopy using femtosecond light pulses from the VUV to the x-ray range. Due to the comparably low output of HHG sources the necessity of efficient optical elements arises while the amount of said elements must be minimal. A solution is found with off-axis reflection zone plates (RZP). They allow focusing and monochromatizing the VUV and x-ray radiation with only one single element while preserving the pulse duration. At the HHG setup at HZB/BESSYII we have characterized the properties of RZPs for the monochromatization and focusing of a femtosecond VUV photon source. The setup is generating 50 fs pulses and here we used photon energies between 15 and 30 eV. Three RZPs were each calculated and designed for a specific harmonic wavelength on a gold coated plane substrate. As each RZP focuses a different wavelength to the same spot so this arrangement can be easily used to select and focus a desired laser high-order harmonic. The diffracted light i.e. focal point and spectrum was recorded on an x-ray CCD camera and spectral resolution and focal characteristics were determined.