Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.18: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1

Towards coherent time-resolved all-XUV spectroscopy — •Andreas Wituschek¹, Lukas Bruder¹, Ulrich Bangert¹, Tim Laarmann^2,3, and Frank Stienkemeier¹ — ¹Universität Freiburg, Physikalisches Institut, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany — ³The Hamburg Centre for Ultrafast Imaging CUI, Luruper Chaussee 149, 22761 Hamburg, Germany

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. Recent experiments have shown that in seeded HGHG free electron lasers (FEL) the emitted XUV pulses inherit the coherence properties of the seed pulses [1]. We suggest an approach based on acousto-optical phase modulation on the seed laser with subsequent seeding of the FEL and lock-in detection at the harmonics of the seed modulation. 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 present the first step towards this approach: extending the phase modulation scheme towards UV wavelengths (260nm) and high intensity femtosecond laser pulses in combination with detection in dilute samples.

[1] Gauthier et al., PRL 116, 024801 (2016)