Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Time-resolved spectroscopy

A 6.1: Hauptvortrag

Montag, 6. März 2017, 17:00–17:30, HS 20

Phase-modulated harmonic light spectroscopy — •Lukas Bruder, Ulrich Bangert, Marcel Binz, Andreas Wituschek, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg

Coherent time-resolved spectroscopy is a powerful tool to study ultrafast dynamics in complex systems. It is highly desirable to extend these techniques to the XUV spectral range. 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 of the driving/seed laser combined with harmonic lock-in detection. In this approach, demands on phase stability are drastically reduced and signals are efficiently isolated and amplified. We demonstrate this concept in a proof-of-principle study with second harmonic generation. The concept is characterized in a femtosecond pump-probe experiment measuring electronic wave packet dynamics in atomic systems. Our results show promise for an implementation in HHG and HGHG light sources.