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Title:Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser
Authors:Rebernik Ribič, Primož (Author)
De Ninno, Giovanni (Author)
et al.
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Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:free electron laser, coherence, x-rays
Year of publishing:2019
Number of pages:8
Numbering:0
COBISS_ID:5380859  Link is opened in a new window
URN:URN:SI:UNG:REP:83ZLUN1C
DOI:10.1038/s41566-019-0427-1 Link is opened in a new window
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Record is a part of a journal

Title:Nature Photonics
Publisher:Nature Research (part of Springer Nature)
ISSN:1749-4885
Year of publishing:2019

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