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: |
2019 |
Typology: |
1.01 - Original Scientific Article |
Organization: |
UNG - University of Nova Gorica |
UDC: |
53 |
COBISS: |
5380859
|
ISSN: |
1749-4885 |
Views: |
2622 |
Downloads: |
0 |
Average score: |
0 (0 votes) |
Metadata: |
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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 |