IR/visible pump-probe experiments

In the mid-infrared spectral range the optical phonon modes dominate the optical response. This enables selective pumping of the phonon subsystem. On the contrary, the electronic response can be monitored in the visible range. This opens the door towards the electron-phonon coupling studies in the time domain.

Two-colour pump-probe experiments with FELIX radiation as powerful infrared pump hold high promise for the systematic investigation of Electron Phonon Coupling (EPC) in a large family of semiconductor materials.

In particular, the characteristic temporal structure of the FELIX light pulses allows larger micropulse energies as compared to other infrared laser systems.This makes it possible to drive the lattice into a strongly non-equilibrium state. 

Designing a platform for systematic pump-probe experiments is a promising direction for the future development of spectroscopic research at FELIX Laboratory.