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MA: Fachverband Magnetismus
MA 30: Ultrafast Magnetization III
MA 30.4: Vortrag
Mittwoch, 18. März 2020, 10:15–10:30, HSZ 101
Characterization of high harmonics spectra generated by the 1.3TW /1 kHz JuSPARC laser system in different gas targets — •Christian Greb1, Roman Adam1, Sarah Heidtfeld1, Fangzhou Wang1, Derang Cao1,2, Markus Büscher1, and Claus M. Schneider1 — 1Forschungszentrum Jülich, Peter Grünberg Institute, 52425 Jülich, Germany — 2College of Physics, Qingdao University, 266071 Qingdao, China
High harmonic generation (HHG) is a well-established technique for generation of spatially and temporal coherent light pulses from the EUV to soft x-ray region (20 eV - 300 eV). The maximum achievable photon energy (HHG cut-off) can be increased by employing higher intensity and longer wavelength of the fundamental laser light [1]. For our experiments, intended to elucitdate spin and charge dynamics in complex materials, we recently commissioned a new Ti:Sapphire based laser system (λ∼ 800nm) capable of generating pulse energies up to 38 mJ at a pulse duration of 30 fs (peak power 1.3 TW) and a repetition rate of 1 kHz. In our first experiments, we demonstrate that we can control the HHG process by varying laser intensity, gas pressure and elemental composition, pulse duration, laser focus and and by tuning the gas-target position. In the next step we enhance the maximum HHG energy by tuning the wavelength of the fundamental driving light by employing optical parametric amplification. Our experimental studies provide further insight into the process of high harmonic generation at high peak intensities.
[1] T. Popmintchev et al., Science 336, 6086 (2012)