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8 November 2024 All-optical terahertz-driven ultrafast photogun
Jianwei Ying, Xie He, Dace Su, Lingbin Zheng, Tobias Kroh, Timm Rohwer, Moein Fakhari, Günther Kassier, Jingui Ma, Peng Yuan, Nicholas H. Matlis, Franz X. Kärtner, Dongfang Zhang
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Proceedings Volume 13247, Infrared, Millimeter-Wave, and Terahertz Technologies XI; 1324705 (2024) https://doi.org/10.1117/12.3036297
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China
Abstract
Terahertz (THz)-based electron acceleration has potential as a technology for next-generation cost-efficient compact electron sources. Here we present a novel millimeter-scale multicell waveguide-based THz-driven photogun that exploits field enhancement to boost the electron energy, a movable cathode to achieve precise control over the accelerating phase as well as multiple cells for exquisite beam control. The short driving wavelength enables a peak acceleration gradient as high as ~3 GV m−1. Using microjoule-level single-cycle THz pulses, we demonstrate electron beams with up to ~14 keV electron energy, 1% energy spread and ~0.015 mm mrad transverse emittance. With a highly integrated rebunching cell, the bunch is further compressed by about ten times to 167 fs with ~10 fC charge. High-quality diffraction patterns of single-crystal silicon and projection microscopy images of the copper mesh are achieved. We are able to reveal the transient radial electric field developed from the charged particles on a copper mesh after photoexcitation with high spatio-temporal resolution, providing a potential scheme for plasma-based beam manipulation. Overall, these results represent a new record in energy, field gradient, beam quality and control for a THz-driven electron gun, enabling real applications in electron projection microscopy and diffraction. This is therefore a critical step and milestone in the development of all-optical THz-driven electron devices, validating the maturity of the technology and its use in precision applications.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Jianwei Ying, Xie He, Dace Su, Lingbin Zheng, Tobias Kroh, Timm Rohwer, Moein Fakhari, Günther Kassier, Jingui Ma, Peng Yuan, Nicholas H. Matlis, Franz X. Kärtner, and Dongfang Zhang "All-optical terahertz-driven ultrafast photogun", Proc. SPIE 13247, Infrared, Millimeter-Wave, and Terahertz Technologies XI, 1324705 (8 November 2024); https://doi.org/10.1117/12.3036297
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KEYWORDS
Terahertz radiation
Diffraction
Ultrafast imaging
Ultrafast phenomena
Electron microscopy
Electron beams
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