Primož Rebernik Ribič (Author), Alessandro Abrami (Author), Laura Badano (Author), Maurizio Bossi (Author), Hans-Heinrich Braun (Author), Niky Bruchon (Author), Flavio Capotondi (Author), Davide Castronovo (Author), Marco Cautero (Author), Paolo Cinquegrana (Author), Giovanni De Ninno (Author)

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

laserji na proste elektrone;koherenca;rentgenski žarki;free electron laser;coherence;x-rays;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 53
COBISS: 5380859 Link will open in a new window
ISSN: 1749-4885
Views: 2622
Downloads: 0
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: str. 555-561
Volume: ǂVol. ǂ13
Issue: ǂiss. ǂ8
Chronology: 2019
DOI: 10.1038/s41566-019-0427-1
ID: 11132571