Speaker
Description
Laser-based electro-optic detection is a well-known tool for characterizing electron bunch shapes - and electric fields in general – in single-shot. However, reaching sub-ps resolution together with long acquisition length still remains a challenging problem. This motivated a search for novel conceptual approaches to the problem, based on the so-called diversity schemes* (i.e., using multiple simultaneous measurements for retrieving an electron bunch shape). In this spirit, we reconsider here the traditional technique, consisting of imprinting the electric field of interest onto an chirped optical probe, and of recording optical spectra of the modulated pulses. A key point is a totally novel approach for inverting the problem, i.e., for retrieving the bunch (or THz pulse) shape from the measurements. We will also present the first numerical and experimental tests of this single-shot measurement method. The immediate applications are bunch shape monitors at FLASH and European XFEL, however such methods have further potential in applications in characterizing THz CTR or FELs sources.
Footnotes
[*] Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording, E. Roussel et al., Light: Science &Applications, 11, 14 (2022)
Funding Agency
- ANR-DFG (ULTRASYNC project)
- CEMPI LABEX
- CPER Wavetech
