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Michizono, S.

Paper Title Page
MOPPH046 Operation of Near-infrared FEL at Nihon University 114
 
  • A. Enomoto, S. Fukuda, K. Furukawa, S. Michizono, S. Ohsawa
    KEK, Ibaraki
  • Y. Hayakawa, K. Nakao, K. Nogami, T. Tanaka, K. Hayakawa
    LEBRA, Funabashi
  • M. Inagaki, T. Kuwada, T. Sakai, I. Sato
    Nihon University
 
  The near-infrared FEL at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been operated for a variety of scientific applications since 2003. The stability of the FEL power was improved appreciably by the advanced stability of the 125 MeV electron linac. Currently fundamental FEL wavelength ranges from 1 to 6 microns, which is restricted by the electron energy and the optical devices. The higher harmonics in the visible region is also available. The maximum macropulse output energy of 60 mJ/pulse has been obtained at a wavelength of 1725 nm. The short FEL resonator at LEBRA causes relatively high optical energy density on the surface of the resonator mirrors; present copper-based Ag mirrors in use at LEBRA are not durable enough for long term operation. As an alternative way of generating intense harmonics in the visible to near-UV region, second and third harmonic generation by means of non-linear optical devices has been tested for the FELs around 1.5 microns as input fundamental photons.