Ultrafast Science and Technologies at ALLS

We have access to a 750TW Titanium-Sapphire laser system and the facility will be soon upgraded with sub-kW Ytterbium laser systems including a 500W unit operating at 1kHz repetition rate. Over recent years, I have used this facility to develop a set of unique tools to study ultrafast dynamics in molecules and solids. In my talk, I will present pulse compression with the stretched hollow-core fiber approach enabling two-cycle pulses with sub-TW peak power at 1.8 microns. To increase the peak power, I am going to discuss Frequency domain Optical Parametric Amplification and the capability of this approach to generate CEP stable mid-IR laser pulses. Furthermore, in the near future, using the sub-kW Ytterbium laser systems, the performances of these laser sources will be upscaled. In parallel, we capitalize on these developments to push table-top X-ray sources using high harmonic generation, enabling beamlines capable of Resonant X-ray Magnetic Scattering (RXMS) for time-resolved spectroscopy with element specificity. We use them to track ultrafast magnetization dynamics at the M-edge of Cobalt (60 eV) and at the N-edge of Terbium (155 eV).