| Title: | Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser |
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| Authors: | ID Rebernik Ribič, Primož, Elettra Sincrotrone Trieste, Univerza v Novi Gorici (Author)
ID De Ninno, Giovanni, Elettra Sincrotrone Trieste, Univerza v Novi Gorici (Author), et al. |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | free electron laser, coherence, x-rays |
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| Year of publishing: | 2019 |
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| Number of pages: | 8 |
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| Numbering: | 0 |
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| PID: | 20.500.12556/RUNG-4793 |
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| COBISS.SI-ID: | 5380859 |
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| DOI: | 10.1038/s41566-019-0427-1 |
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| NUK URN: | URN:SI:UNG:REP:83ZLUN1C |
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| Publication date in RUNG: | 07.05.2019 |
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| Views: | 4712 |
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| Downloads: | 0 |
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