Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Poster Session - Atomic Physics III
A 22.27: Poster
Mittwoch, 11. März 2020, 16:00–18:00, Empore Lichthof
Phase-cycling technique for extreme ultraviolet pulses — •Andreas Wituschek1, Lukas Bruder1, Oleg Kornilov2, Tobias Witting2, Laura Maikowski2, Marc J.J. Vrakking2, and Frank Stienkemeier1 — 1Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — 2Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin, Germany
The advent of intense ultrashort light sources in the extreme ultraviolet (XUV) allows for extension of coherent nonlinear spectroscopy techniques (eg. four wave mixing, multidimensional spectroscopy, CARS) to this wavelength range, providing access to unprecedented temporal resolution and site/chemical selectivity. However, these techniques require interferometric stability and high sensitivity for weak nonlinear signals, which are experimentally difficult to achieve in the XUV.
In this work we developed a laboratory-scale XUV source suitable for applications in coherent spectroscopies. We generated a collinear UV pulse pair (262 nm, 50 µJ, 30 fs) in an interferometric setup with independent control over delay and relative phase of the pulses. With this pulse pair we generated the third (14.2 eV) harmonic in krypton and found that the resulting XUV pulse pair inherits the phase information of the UV pulses, allowing us to impart a phase-cycling scheme on the XUV pulse pair. To test the scheme, we isolated the coherent oscillations of an electronic wave-packet in argon atoms, where the states participating in the wave-packet are separated by 14.2 eV. Our approach provides the necessary stability and sensitivity to extent coherent nonlinear spectroscopy to the XUV spectral range.