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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Subpicosecond bunch train production for a tunable mJ level THz source.

S Antipov1, M Babzien, C Jing

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Researchers converted electron bunch energy modulation into density modulation, creating microbunches. This generates tunable terahertz (THz) radiation, paving the way for compact THz sources.

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Area of Science:

  • * Physics
  • * Accelerator Physics
  • * Terahertz (THz) Science and Technology

Background:

  • * Previous work demonstrated energy modulation of electron bunches in dielectric-lined waveguides.
  • * Converting energy modulation to density modulation is crucial for generating coherent radiation.

Purpose of the Study:

  • * To demonstrate the conversion of energy modulation to density modulation in electron bunches.
  • * To form subpicosecond microbunches using magnetic optics.
  • * To generate and tune coherent terahertz (THz) radiation.

Main Methods:

  • * Utilized magnetic optics (chicane) to convert energy modulation into density modulation.
  • * Employed infrared interferometry to measure the frequency of the generated THz radiation.
  • * Investigated the tunability of the THz source by adjusting the electron bunch's energy chirp.

Main Results:

  • * Successfully converted energy modulation into beam density modulation, forming microbunches.
  • * Observed a strong coherent transition radiation signal from the microbunches.
  • * Demonstrated tunability of the THz radiation carrier frequency from 0.68 to 0.9 THz.

Conclusions:

  • * The study successfully demonstrated the formation of microbunches and tunable THz radiation generation.
  • * The proposed method offers a pathway towards compact, tunable, and narrowband THz sources.
  • * This technology has potential applications in various fields requiring intense THz radiation.