Hannover 2016 – scientific programme

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A: Fachverband Atomphysik

A 22: Interaction with VUV and X-ray light

A 22.5: Poster

Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof

Phase modulated harmonic detection to facilitate time-resolved coherent XUV spectroscopy — •Ulrich Bangert, Lukas Bruder, Marcel Binz, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, 79104 Freiburg

Coherent time-resolved spectroscopy is a powerful tool to study ultrafast dynamics in complex systems. Extending these techniques to the XUV spectral region would allow studying core excitations, thus providing site specific information. However, demands on phase stability increase significantly when going to short wavelengths and advanced pulse manipulation in the XUV is challenging. We suggest an approach based on acousto-optical phase modulation on the fundamental frequency combined with lock-in detection at the harmonics. In this way, pulse manipulation can be performed with standard optics. Moreover, demands on phase stability are drastically reduced and signals are efficiently isolated and amplified. We demonstrate this scheme in a proof of principle experiment incorporating second harmonic generation to measure electronic wave packet dynamics in atomic systems. The high quality of our data shows promise for implementation of the scheme in table top HHG or seeded FEL sources.