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Updated: Dec 22, 2025

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Volt-per-Ångstrom terahertz fields from X-ray free-electron lasers.
T Tanikawa1, S Karabekyan1, S Kovalev2
1European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany.
Modern X-ray free-electron lasers can generate intense terahertz (THz) transients using superconducting THz undulators. This advancement enables new research, including X-ray movies of THz-driven chemistry.
Area of Science:
- Physics
- Chemistry
- Materials Science
Background:
- Electron linear accelerators are crucial for modern X-ray free-electron lasers (XFELs).
- Terahertz (THz) transients offer unique properties for scientific investigation.
Purpose of the Study:
- To investigate the generation of intense THz transients using XFEL infrastructure.
- To explore new research possibilities enabled by these THz transients.
Main Methods:
- Implementation of a compact, superconducting THz undulator.
- Utilizing ultra-short GeV electron bunches from the linear accelerator.
Main Results:
- Generation of intense, tunable, quasi-monochromatic THz transients.
- Achieved peak electric fields of V Å -1 and peak magnetic fields >10 T.
- Demonstrated dual use of electron bunches for THz generation and XFEL operation.
Conclusions:
- A superconducting THz undulator enhances XFEL capabilities for THz emission.
- This technology opens avenues for advanced research, such as observing THz-driven chemical dynamics.
- Minor infrastructure extensions can unlock significant scientific potential.
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