SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: Poster Session I

HL 3.25: Poster

Monday, September 27, 2021, 10:00–13:00, P

Nonlinear THz spectroscopy at TeraFERMI — •Johannes Schmidt, Paola Di Pietro, and Andrea Perucchi — Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy

TeraFERMI is a THz beamline at the Free-electron laser (FEL) FERMI. After passing the undulator of the FEL the electron bunches are refocused on a thin slab and generate coherent transition radiation (CTR) as THz pulses with a spectral range of typically 0.1 to 6 THz. TeraFERMI provides strong single-cycle pulses with MV/cm electric peak fields or magnetic peak fields up to 1 T, which is in combination with the low repetition rate of 50 Hz an ideal source for nonlinear spectroscopy in many sciences from biology to physics. The short ps THz-pulses are phase-envelope stable with a low temporal jitter of about 66 fs (rms) and is therefore perfect for THz-pump probe experiments with different probe colors. Up to now, we focused on THz-pump NIR-probe and fluence-dependent THz spectroscopy. Thereby is the radial polarization of the beam a specialty of the CTR THz-beam and allows for longitudinal spectroscopy. Here, we report about the latest technological advances of TeraFERMI as well as first pilot experiments.