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Lasing Below 170 nm Using an Oscillator FEL

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0064942· OSTI ID:1824328
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States); Duke University
  2. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  3. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States); North Carolina Central Univ., Durham, NC (United States)
  4. Laser Zentrum Hannover e.V. (Germany)
  5. Laser Zentrum Hannover e.V. (Germany); Laseroptik GmbH, Garbsen (Germany)
  6. Laser Zentrum Hannover e.V. (Germany); Trumpf Laser GmbH & Co., Ditzingen (Germany)
The short wavelength operation of free-electron laser (FEL) oscillators is limited by the availability of high-reflectivity, thermally stable, and radiation-resistant FEL mirrors in the VUV wavelength. We report our recent work to extend the shortest lasing wavelength of the oscillator FEL to 168.6 nm using a storage ring FEL. This progress has been made possible by developing a new FEL configuration with substantially reduced undulator harmonic radiation on the FEL mirror, a thermally stable FEL optical cavity, and a new type of high-reflectivity fluoride-based multilayer coating with a protective capping layer. Using these fluoride-based mirrors, we have demonstrated storage ring FEL lasing from 168.6 to 179.7 nm with excellent beam stability. Employing this VUV FEL in Compton scattering, we have produced the first 120 MeV gamma rays at the High Intensity Gamma-ray Source (HIGS). Furthermore, operating the HIGS in this new high-energy region will create many new opportunities for photonuclear physics research, in particular, the low-energy QCD research.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
Laser Zentrum Hannover e.V.
Grant/Contract Number:
FG02-97ER41033
OSTI ID:
1824328
Alternate ID(s):
OSTI ID: 1829388
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 18 Vol. 130; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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