Beamline Description

Experimental station

We presently offer to our users three different type of set-ups.

The fluence dependent set-up allows adressing the non-linear transmission or reflection properties of the materials of interest as a function of the THz fluence. The fluence can controlled over more than 3 orders of magnitude through a set of polarisers. The detection of the transmitted or reflected signal is performed through electro-optic sampling.

Our THz-pump/IR-probe set-up has been recently renewed. Here in particular non-equilibrium physics such as charge-carrier dynamics as well as nonnlinear effects like the Pockels and Kerr effects can be studied. Thereby NIR probe pulses have a 10 nm bandwidth centered at either 780 or 1560 nm. We designed a pump-probe setup whit which we can switch straightforward between two types of experiments: (i) a polarization state sensitive measurement of the NIR (THz-induced anisotropy) and (ii) a pure NIR intensity measurement probing the THz-induced change in reflection and transmission. The most interesting feature in this two-color pump-probe setup is a simultaneous data acquisition of reflection and transmission signals. Consequently, we gain the full information about the material's optical properties.

THz pump/THz probe experiments are also possible, by splitting the pulses from TeraFERMI and by recombining them on the sample after a suitable control of their intensity, polarisation, spectral content, and delay, thus allowing for many different class of experiments.