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A: Fachverband Atomphysik

A 25: Poster: Attosecond physics

A 25.3: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Design of an in-situ XUV spectrometer for attosecond experiments — •Michael Schönwald, Alexander Sperl, Andreas Fischer, Philipp Coerlin, Arne Senftleben, Thomas Pfeifer, Robert Moshammer, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland

We present the design of a new extended ultraviolet (XUV) spectrometer for our attosecond beam line. We are producing attosecond pulses (AP) via high harmonic generation (HHG) in a small gas cell filled with rare gases in order to do pump-probe experiments in a reaction microscope (ReMi). Currently, a self-phase modulation hollow fiber filled with Neon in combination with a chirped mirror compressor is implemented in our setup to broaden the spectrum and shorten the infrared (IR) laser pulses from 30 fs to less than 10 fs for experiments with single AP. To measure the HHG spectra during ReMi type experiments and to be able to estimate the pulse durations of the AP, we build a spectrometer which uses the light transmitted through the interaction region of the ReMi. Immediately after entering the XUV spectrometer, the IR radiation is filtered out by thin Al or Zr foils. A spherical mirror is then used to focus the high harmonics through a transmission grating onto a MCP detector. Using a grazing-incidence reflection off a mirror with a 30 nm thin Au or B4C surface coating, we avoid bandwidth limitations and we are expecting a reflectivity of up to 75%. We will show first experimental results [hopefully] using the few-cycle driving laser pulses for HHG and discuss follow-on experiments enabled by the in-line combination of ReMi and XUV spectrometer.