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Open AccessArticle

The TeraFERMI Electro-Optic Sampling Set-Up for Fluence-Dependent Spectroscopic Measurements

1
Elettra-Sincrotrone Trieste S.C.p.A, S.S.14 km 163.5, Basovizza, 34149 Trieste, Italy
2
CNR-IOM, Area Science Park Basovizza, 34146 Trieste, Italy
3
Dipartimento di Fisica, Università “La Sapienza”, P.le A. Moro 2, 00185 Roma, Italy
*
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(1), 8; https://doi.org/10.3390/condmat5010008
Received: 10 December 2019 / Revised: 16 January 2020 / Accepted: 19 January 2020 / Published: 20 January 2020
TeraFERMI is the THz beamline at the FERMI free-electron-laser facility in Trieste (Italy). It uses superradiant Coherent Transition Radiation emission to produce THz pulses of 10 to 100 μ J intensity over a spectral range which can extend up to 12 THz. TeraFERMI can be used to perform non-linear, fluence-dependent THz spectroscopy and THz-pump/IR-probe measurements. We describe in this paper the optical set-up based on electro-optic-sampling, which is presently in use in our facility and discuss the properties of a representative THz electric field profile measured from our source. The measured electric field profile can be understood as the superimposed emission from two electron bunches of different length, as predicted by electron beam dynamics simulations.
Keywords: THz spectroscopy; free-electron-lasers; nonlinear optics THz spectroscopy; free-electron-lasers; nonlinear optics
MDPI and ACS Style

Adhlakha, N.; Di Pietro, P.; Piccirilli, F.; Cinquegrana, P.; Di Mitri, S.; Sigalotti, P.; Spampinati, S.; Veronese, M.; Lupi, S.; Perucchi, A. The TeraFERMI Electro-Optic Sampling Set-Up for Fluence-Dependent Spectroscopic Measurements. Condens. Matter 2020, 5, 8.

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