Improved stabilization scheme for extreme ultraviolet quantum interference experiments

Daniel Uhl; Andreas Wituschek; Ulrich Bangert; Marcel Binz; Carlo Callegari; Michele Di Fraia; Oksana Plekan; Kevin Charles Prince; Giulio Cerullo; Luca Giannessi; Miltcho Danailov; Giuseppe Sansone; Tim Laarmann; Rupert Michiels; Marcel Mudrich; Paolo Piseri; Richard James Squibb; Raimund Feifel; Stefano Stranges; Frank Stienkemeier; Lukas Bruder

doi:10.1088/1361-6455/ac5f74

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arXiv · 2112.03770

Improved stabilization scheme for extreme ultraviolet quantum interference experiments

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Abstract

Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses. Recently, an efficient phase stabilization scheme was introduced for seeded XUV free electron lasers (FELs) combining shot-to-shot phase modulation with lock-in detection. This method stabilized the seed laser beampath on the fundamental ultraviolet wavelength to a high degree. Here, we extend this scheme including the stabilization of the XUV beampath, incorporating phase fluctuations from the FEL high gain harmonic generation process. Our analysis reveals a clear signal improvement with the new method compared to the previous stabilization scheme.

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Daniel Uhl, Andreas Wituschek, Ulrich Bangert, Marcel Binz, Carlo Callegari, Michele Di Fraia, Oksana Plekan, Kevin Charles Prince, Giulio Cerullo, Luca Giannessi, Miltcho Danailov, Giuseppe Sansone, Tim Laarmann, Rupert Michiels, Marcel Mudrich, Paolo Piseri, Richard James Squibb, Raimund Feifel, Stefano Stranges, Frank Stienkemeier, Lukas Bruder. 2021-12-07. Improved stabilization scheme for extreme ultraviolet quantum interference experiments. https://doi.org/10.1088/1361-6455%2Fac5f74

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