研究目的
Investigating the properties of the TeraFERMI beamline for THz non-linear and pump-probe studies, particularly focusing on the electro-optic-sampling set-up for characterizing THz electric field emission.
研究成果
The TeraFERMI beamline's THz emission is characterized by a combination of two main components originating from the ps-long electron bunch profile and a ~100 fs long high current spike, in agreement with previous electron beam dynamics studies. This finding is crucial for the interpretation of non-linear THz spectroscopy and pump-probe dynamics.
研究不足
The study is limited by the laser pulse duration and jitter in the electron bunch arrival time, which affect the measured electric field line-shape. Additionally, the velocity mismatch between THz and optical pulses in the ZnTe crystal and absorption from ZnTe itself due to its optical phonon may limit the detection of high frequency components.
1：Experimental Design and Method Selection:
The study utilizes the TeraFERMI beamline at the FERMI free-electron-laser facility, employing electro-optic-sampling (EOS) to measure THz electric field profiles.
2：Sample Selection and Data Sources:
The THz pulses are generated using Coherent Transition Radiation (CTR) from relativistic electrons.
3：List of Experimental Equipment and Materials:
Includes a 1μm-thick Al membrane, a wedged diamond window, ZnTe crystal for EOS, and a femtosecond infrared fiber laser (MENLO C-Fiber 780).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: THz pulses are polarized and attenuated before interaction with the sample, followed by EOS measurements to probe the time-resolved evolution of THz electric fields.
5：Data Analysis Methods:
The electric field intensity is determined using standard relationships, and spectral analysis is performed to understand the emission properties.
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