Author: Ohgaki, H.
Paper Title Page
FRXA05
Record High Extraction Efficiency of Free electron Laser Oscillator  
 
  • H. Zen, H. Ohgaki
    Kyoto University, Kyoto, Japan
  • R. Hajima
    QST, Tokai, Japan
 
  Funding: This work was supported by the MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) Grant Number JPMXS0118070271.
The high­est ex­trac­tion ef­fi­ciency (9.4%) of a free elec­tron laser (FEL) os­cil­la­tor has been achieved at the mid-in­frared FEL fa­cil­ity of Kyoto Uni­ver­sity*. Be­cause of the in­ter­ac­tion be­tween the elec­tron beam and FEL elec­tro­mag­netic field, a max­i­mum elec­tron en­ergy de­crease of 16% was ob­served. The mea­sured en­ergy de­crease was con­sis­tent with the mea­sured FEL spec­trum. An FEL mi­cro-pulse en­ergy of ap­prox­i­mately 100 mi­cro-J with mi­cro-pulse du­ra­tion of 150 fs was ob­served. This re­sult is an im­por­tant mile­stone for the high-ex­trac­tion-ef­fi­ciency FEL os­cil­la­tor and will con­tribute to the strong-field physics of atoms and mol­e­cules.
*H. Zen et al., Appl. Phys. Express 13, 102007 (2020).
 
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