Table-top Nonlinear Extreme Ultraviolet Spectroscopy

Helk, T.; Berger, E.; Jamnuch, S.; Hoffmann, L.; Kabacinski, A.; Gautier, J.; Tissandier, F.; Goddet, J. P.; Chang, H. -T.; Oh, J.; Pemmaraju, C. D.; Pascal, T. A.; Sebban, S.; Spielmann, C.; Zuerch, M.

doi:10.48550/arXiv.2009.05151

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Table-top Nonlinear Extreme Ultraviolet Spectroscopy

preprint

posted on 2023-11-30, 20:33 authored by T. Helk, E. Berger, S. Jamnuch, L. Hoffmann, A. Kabacinski, J. Gautier, F. Tissandier, J. P. Goddet, H. -T. Chang, J. Oh, C. D. Pemmaraju, T. A. Pascal, S. Sebban, C. Spielmann, M. Zuerch

The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties have limited the availability of nonlinear XUV and x-ray spectroscopies to free electron lasers (FEL). Here, we demonstrate second harmonic generation (SHG) on a table-top XUV source for the first time by observing SHG at the Ti M2,3-edge with a high harmonic seeded soft x-ray laser (HHG-SXRL) [1,2]. Further, this experiment represents the first SHG experiment in the XUV. First-principles electronic structure calculations are used to confirm the surface specificity and resonant enhancement of the SHG signal. The realization of XUV-SHG on a table-top source with femtosecond temporal resolution opens up tremendous opportunities for the study of element-specific dynamics in multi-component systems where surface, interfacial, and bulk-phase asymmetries play a driving role in smaller-scale labs as opposed to FELs.