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1 results

  • Harmonic-enhanced high-gain harmonic generation for a high repetition rate free-electron laser

  • Part of
  • Sheng Zhao, Weilun Qin, Senlin Huang
  • Journal:
    High Power Laser Science and Engineering / Volume 10 / 2022
    Published online by Cambridge University Press:
    10 December 2021, e4
    • Article
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  • High-gain harmonic generation (HGHG) is effective to produce fully coherent free-electron laser (FEL) pulses for various scientific applications. Due to the limitation of seed lasers, HGHG typically operates at a low repetition rate. In this paper, a harmonic-enhanced HGHG scheme is proposed to relax the peak power requirement for the seed laser, which can therefore operate at megahertz and a higher repetition rate. Moreover, the setup of the scheme is compact and can be adopted in an existing single-stage HGHG facility to extend the shortest achievable wavelength. Simulations show that FEL emission at 13.5 nm (20th harmonic) can be obtained with a 270 nm, 1 MW (peak power) seed laser.