The TeraFERMI Electro-Optic Sampling Set-Up for Fluence-Dependent Spectroscopic Measurements
oleh: Nidhi Adhlakha, Paola Di Pietro, Federica Piccirilli, Paolo Cinquegrana, Simone Di Mitri, Paolo Sigalotti, Simone Spampinati, Marco Veronese, Stefano Lupi, Andrea Perucchi
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-01-01 |
Deskripsi
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 <inline-formula> <math display="inline"> <semantics> <mi>μ</mi> </semantics> </math> </inline-formula>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.