Femtosecond laser amplifier with optic parametric amplifier

• Subject Area: Condensed Matter Physics
• Term: Funded in 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 425376614

The Femtosecond-Laser-Amplifier System with Parametric Optical Amplifier will be used to realise time-resolved photoelectron spectroscopy experiments with ultrashort extreme ultraviolet (XUV) light pulses. The laser system will in particular be used to pump two high-harmonic generation light sources for the generation of XUV light in combination with an optical parametric amplifier, which will be used as a tuneable light source in the visible range for a tailored excitation of the samples. Using both an angle-resolved photoelectron spectrometer and a so-called momentum microscope, we will carry out experiments in a quasi-adiabatic (relaxation dynamics of hot electrons) and in a non-adiabatic regime (many-body relaxation dynamics after a strong excitation, optically induced phase transitions). The following fields of research will be covered:1) Ultrafast dynamics at hybrid interfaces2) Phase separation in correlated materials3) Band-structure dynamics in correlated materials4) Electron dynamics in low-dimensional systems5) Spin-dependent transient band structures in ultrafast demagnetisation6) Femtosecond orbital tomography at hybrid interfaces7) Photoexcitations in perovskite halidesThe femtosecond amplifier system will supplement an already available laser system, which is due to the above-mentioned projects and additional 5 projects in the area of optical spectroscopy completely overloaded. The already available laser will then be used for the optical spectroscopy experiments, only, and the new laser system will be used for the photoelectron spectroscopy experiments.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Femtosekunden-Laserverstärkersystem mit optisch-parametrischem Verstärker
• Instrumentation Group: 5700 Festkörper-Laser
• Applicant Institution: Georg-August-Universität Göttingen
• Leader: Professor Dr. Stefan Mathias