Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.71: Poster
Montag, 14. März 2011, 16:30–19:30, P1
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
Conventional grazing incidence grating monochromators pose major disadvantages to monochromatizing femtosecond pulses in the vacuum ultraviolet (VUV) photon energy range. Their transmission efficiency is very low and they increase the pulse duration considerably. Additionally, the efficiency further decreases with every optical element added to a given setup. Using the laser-based high-harmonic generation (HHG) setup at HZB/BESSYII we have characterized the properties of off-axis reflection zone plates (RZP) for simultaneously monochromatizing and focusing a femtosecond VUV photon source. Our setup generates 50 fs pulses and here we used photon energies between 15 and 30 eV. Three RZPs, each designed for a specific harmonic were etched on a gold coated plane substrate. Here we present the proof of principle of such a system, its spectral resolution and focal characteristics among others. The results show clearly that the RZPs besides being cheaper and easier to manufacture have a higher efficiency and good energy resolution. Furthermore, we demonstrate how with these RZPs one can easily trade in dispersion (spectral resolution) versus pulse broadening online to adapt these parameters.