| Pushing four wave mixing experiments to the VUV and X-rays regimes. | |
| Presenter | Andrea Battistoni |
| Presentation Type | Poster |
| Full Author List |
Andrea Battistoni, Filippo Bencivenga, Claudio Masciovecchio, Emily Sistrunk, Jacob Grilj, Thomas Wolf, Markus Guehr |
| Affiliations |
Stanford PULSE Institute, SLAC National Accelerator Laboratory |
| Abstract | The combination of site and element selective core level spectroscopy with time-resolved non-linear techniques is an important new method for the investigation of materials. In particular element sensitive four wave mixing (FWM) can have wide reaching applications for studying charge transfer dynamics in photoelectrochemical cells, devices that mimic natural photosynthesis to convert sunlight into chemical energy. Thanks to the advent of the FEL's, FWM experiments at core resonance energies are not anymore a theoretical speculation. At FERMI, we demonstrated EUV FWM using fully coherent FEL pulses which drive coherent electronic and acoustic excitations in a prototypical SiO2 sample. This result paves the way for practical exploitation of non-linear optics in the EUV-SXR range. In our laser lab, we used optical transient gratings probed by EUV continua from HHG to detect the well-known insulator to metal transition in VO2 at the V M-edge. Our recently demonstrated heterodyne scheme combined with tilted wave-fronts to improve time resolution, pave the application for FWM in the soft x-ray range. |