Record Details

Title:
Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser
Affiliation(s):
EuXFEL staff, Other
Author group:
Simulation of Photon Fields
Topic:
Scientific area:
Abstract:
X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniques to shorter wavelengths, adding element specificity by exciting and probing electronic transitions from core levels. These techniques would benefit tremendously from having a stable FEL source, generating spectrally pure and wavelength-tunable pulses. We show that such requirements can be met by operating the FEL in the so-called echo-enabled harmonic generation (EEHG) configuration. Here, two external conventional lasers are used to precisely tailor the longitudinal phase space of the electron beam before emission of X-rays. We demonstrate high-gain EEHG lasing producing stable, intense, nearly fully coherent pulses at wavelengths as short as 5.9 nm (~211 eV) at the FERMI FEL user facility. Low sensitivity to electron-beam imperfections and observation of stable, narrow-band, coherent emission down to 2.6 nm (~474 eV) make the technique a prime candidate for generating laser-like pulses in the X-ray spectral region, opening the door to multidimensional coherent spectroscopies at short wavelengths.
Imprint:
Nature, 2019
Journal Information:
Nature Photonics, 13 (8), 555-561 (2019)
Related external records:
Language(s):
English


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 Record created 2019-12-19, last modified 2019-12-19

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