In our lab we develop and employ light sources that have extremely short pulse durations. In the optical domain we routinely achieve pulse durations of a few femtoseconds covering the whole visible light spectrum and the near-infrared. Locking the electric field of the laser pulse to its envelope, so-called carrier-envelope phase stabilization, allows us to taylor optical and near-infrared laser pulses such that they can either be employed for phase-resolved excitation (“pump”) or for nonlinear up-conversion into the extreme ultraviolet and soft X-ray range (“probe”) allowing for transient absorption spectroscopy in the pump-probe scheme.
Furthermore, the Zuerch Lab conducts experiments together with other research groups at Free-electron laser facilities. There, we leverage the extreme intensities a focused ultrafast X-ray beam can reach for achieving a non-linear X-ray response of the material. This provides access to surface and interfacial electronic properties and allows combining material selectivity and high-resolution imaging with surface specificity. These new tools will provide unique insights in the processes governing for example photocatalythic reactions on nanostructured surfaces.
R. Sollapur, D. Kartashov, M. Zürch, A. Hoffmann, T. Grigorova, G. Sauer, A. Hartung, A. Schwuchow, J. Bierlich, J. Kobelke, M. Chemnitz, Markus A. Schmidt, C. Spielmann. Resonanceenhanced multi-octave supercontinuum generation in antiresonant hollow-core fibers, Light: Science & Applications, 6, e17124 (2017)
H.-T. Chang, M. Zürch, P. M. Kraus, L. J. Borja, D. M. Neumark, and S. R. Leone. Simultaneous generation of sub-5-femtosecond 400 nm and 800 nm pulses for attosecond extreme ultraviolet pump-probe spectroscopy, Optics Letters 41 (22), 5365-5368 (2016)
M. Zürch, C. Kern, P. Hansinger, A. Dreischuh, and Ch. Spielmann. Strong-field physics with singular light beams, Nature Physics 8, 743-746 (2012)
S. Eyring, C. Kern, M. Zürch, and C. Spielmann. Improving high-order harmonic yield using wavefront-controlled ultrashort laser pulses, Optics Express 20 (5), 5601-5606 (2012)