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O: Fachverband Oberflächenphysik

O 22: Ultrafast Surface Dynamics

O 22.3: Vortrag

Dienstag, 17. März 2015, 11:15–11:30, MA 042

Narrowband high harmonic pulses for trARPES using frequency-upconverted Ti:Sapphire lasers — •S. Emmerich¹, S. Eich¹, A. Stange³, A.V. Carr², J. Urbancic¹, T. Popmintchev², M. Wiesenmayer¹, K. Jansen³, A. Ruffing¹, S. Jakobs¹, T. Rohwer³, S. Hellmann³, C. Chen², P. Matyba², L. Kipp³, K. Rossnagel³, M. Bauer³, M.M. Murnane², H.C. Kapteyn², S. Mathias¹, and M. Aeschlimann¹ — ¹University of Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — ²JILA, University of Colorado and NIST, Boulder, CO 80309-0440, USA — ³Institute of Experimental and Applied Physics, University of Kiel, D-24098 Kiel, Germany

trARPES using femtosecond XUV high harmonics has recently emerged as a powerful tool for investigating ultrafast quasiparticle dynamics in correlated-electron materials. However, the full potential of this approach has not yet been achieved because, to date, high harmonics generated by 800 nm wavelength Ti:Sapphire lasers required a trade-off between photon flux, energy and time resolution. Photoemission spectroscopy requires a quasi-monochromatic output, but dispersive optical elements that select a single harmonic can significantly reduce the photon flux and time resolution. Here we show that shorter wavelength driven high harmonic extreme-ultraviolet trARPES is superior to using 800 nm laser drivers since it eliminates the need for any spectral selection, thereby increasing photon flux and energy resolution while preserving excellent time resolution [Eich et al., J. Electron Spectrosc. 195 (2014) 231-236].