Record Details

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser
EuXFEL guest, EuXFEL staff, Other
Author group:
X-Ray Photon Diagnostics
Instrument SQS
Advanced Electronics
The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.
College Park, Md., APS, 2014
Journal Information:
Phys. Rev. X, 4, 4, 041040 (2014)
Related external records:
DOI: 10.1103/PhysRevX.4.041040
WOS: WOS:000345928600001


 Record created 2016-10-11, last modified 2019-02-08

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