Real-time ultrafast oscilloscope with a relativistic electron bunch train

In Hyung Baek, Hyun Woo Kim, Hyeon Sang Bark, Kyu-Ha Jang, Sunjeong Park, Junho Shin, Young Chan Kim, Mihye Kim, Key Young Oang, Kitae Lee, Fabian Rotermund, Nikolay A. Vinokurov and Young Uk Jeong ()
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In Hyung Baek: Korea Atomic Energy Research Institute (KAERI)
Hyun Woo Kim: Korea Atomic Energy Research Institute (KAERI)
Hyeon Sang Bark: Korea Atomic Energy Research Institute (KAERI)
Kyu-Ha Jang: Korea Atomic Energy Research Institute (KAERI)
Sunjeong Park: Korea Atomic Energy Research Institute (KAERI)
Junho Shin: Korea Atomic Energy Research Institute (KAERI)
Young Chan Kim: Korea Atomic Energy Research Institute (KAERI)
Mihye Kim: Korea Atomic Energy Research Institute (KAERI)
Key Young Oang: Korea Atomic Energy Research Institute (KAERI)
Kitae Lee: Korea Atomic Energy Research Institute (KAERI)
Fabian Rotermund: Korea Advanced Institute of Science and Technology (KAIST)
Nikolay A. Vinokurov: Budker Institute of Nuclear Physics SB RAS
Young Uk Jeong: Korea Atomic Energy Research Institute (KAERI)

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract The deflection of charged particles is an intuitive way to visualize an electromagnetic oscillation of coherent light. Here, we present a real-time ultrafast oscilloscope for time-frozen visualization of a terahertz (THz) optical wave by probing light-driven motion of relativistic electrons. We found the unique condition of subwavelength metal slit waveguide for preserving the distortion-free optical waveform during its propagation. Momentary stamping of the wave, transversely travelling inside a metal slit, on an ultrashort wide electron bunch enables the single-shot recording of an ultrafast optical waveform. As a proof-of-concept experiment, we successfully demonstrated to capture the entire field oscillation of a THz pulse with a sampling rate of 75.7 TS/s. Owing to the use of transversely-wide and longitudinally-short electron bunch and transversely travelling wave, the proposed “single-shot oscilloscope” will open up new avenue for developing the real-time petahertz (PHz) metrology.

Date: 2021
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DOI: 10.1038/s41467-021-27256-x

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