A few hundred femtosecond FEL with a few kW average and one GW peak power for academic and industrial applications

Eisuke J. Minehara, Ryoichi Hajima, Masaru Sawamura, Ryoji Nagai, Nobuyuki Nishimori, Nobuhiro Kikuzawa, Masayoshi Sugimoto, Toshihiko Yamauchi, Taketo Hayakawa, Toshiyuki Shizuma

Research output: Contribution to journalConference articlepeer-review


The JAERI FEL group has successfully discovered, and realized the brand-new FEL lasing of 255fs ultrafast pulse, 6-9% high-efficiency, one gigawatt high peak power, a few kilowatts average power, and wide tunability of medium and far infrared wavelength regions at the same time. The new lasing was named to be "high-degeneracy superradianct lasing of FEL". Using the new lasing, we could realize a powerful and efficient free-electron laser(FEL) for industrial uses, for examples, pharmacy, medical, defense, shipbuilding, semiconductor industry, chemical industries, environmental sciences, space-debris, power beaming and so on. In order to realize such a tunable, highly-efficient, high average power, high peak power and ultra-short pulse FEL, we need the efficient and powerful FEL driven by the JAERI compact, stand-alone and zero-boil-off super-conducting rf linac with an energy-recovery geometry. Our discussions on the FEL will cover market-requirements and roadmap for the industrial FELs, some answers from the JAERI compact, stand-alone and zero-boil-off cryostat concept and operational experience over these 10 years, our discovery of the new, highly-efficient, high-power, and ultra-short pulse lasing mode, and the energy-recovery geometry.

Original languageEnglish
Pages (from-to)336-345
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2002
Externally publishedYes
EventThird International Symposium on Laser Precision Microfabrication - Osaka, Japan
Duration: 2002 May 272002 May 31


  • 255 femtosecond pulse width
  • A GW peak power
  • A few kW average power
  • Free-electron laser
  • High-efficiency
  • Stand-alone
  • Super-conducting rf linac
  • Zero-boil-off

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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