Author: Bae, S.
Paper Title Page
TUD03 Fine and Hyperfine Structure of FEL Emission Spectra 276
  • V.V. Kubarev, Ya.V. Getmanov, O.A. Shevchenko
    BINP SB RAS, Novosibirsk, Russia
  • S. Bae, Y.U. Jeong
    KAERI, Daejon, Republic of Korea
  This paper presents the results of experimental investigations of the fine and hyperfine spectral structures of the Novosibirsk free-electron laser (NovoFEL) and the compact free-electron laser of the Korea Atomic Energy Research Institute (KAERI FEL) by means of the optimal instruments, resonance Fabry-Perot interferometers. The very high coherence of the NovoFEL spectrum was measured in regimes with one pulse circulating inside its optical resonator (the coherence length is 7 km, and the relative width of the hyperfine structure lines is 2E-8) and with total absence of coherence between two circulating pulses, i.e. the fine structure. Sixty pulses circulate simultaneously inside the KAERI FEL optical resonator, and the measured coherence length on average covers ten pulses (the coherence length is 1 m; the relative width of the fine structure lines is 10-4).  
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About • paper received ※ 16 August 2019       paper accepted ※ 29 August 2019       issue date ※ 05 November 2019  
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