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  Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser

Kießling, R., Colson, W. B., Gewinner, S., Schöllkopf, W., Wolf, M., & Paarmann, A. (2018). Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser. Physical Review Accelerators and Beams, 21(08): 080702. doi:10.1103/PhysRevAccelBeams.21.080702.

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PhysRevAccelBeams.21.080702.pdf (Publisher version), 2MB
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 Creators:
Kießling, Riko1, Author              
Colson, W. B.2, Author
Gewinner, Sandy3, Author              
Schöllkopf, Wieland3, Author              
Wolf, Martin1, Author              
Paarmann, Alexander1, Author              
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Compass Scientific Engineering, Fremont, California 94539, USA, ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              

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 Abstract: We experimentally demonstrate a single-shot arrival time monitor for short picosecond infrared free-electron laser (IR FEL) pulses based on balanced optical cross-correlation with a synchronized fs table-top laser. Employing this timing tool at the Fritz Haber Institute IR FEL, we observe a shot-to-shot timing jitter of only \SI100fs and minute-scale timing drifts of a few picoseconds, the latter being strictly correlated with the electron beam energy of the accelerator. We acquire sum-frequency cross-correlation data with micro-pulse resolution, providing full access to the IR FEL pulse shape evolution within the macro-pulse. These measurements provide unprecedented insights into the occurence of limit-cycle oscillations of the FEL intensity as a consequence of sub-pulse formation. Our experimental results are complemented by four-dimensional simulations of the nonlinear pulse dynamics in a low-gain FEL oscillator based on Maxwell-Lorentz theory.

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Language(s): eng - English
 Dates: 2018-04-032018-07-232018-08-20
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
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Title: Physical Review Accelerators and Beams
  Abbreviation : Phys. Rev. AB
Source Genre: Journal
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Publ. Info: Ridge, NY, USA : American Physical Society
Pages: 11 Volume / Issue: 21 (08) Sequence Number: 080702 Start / End Page: - Identifier: ISSN: 2469-9888
CoNE: https://pure.mpg.de/cone/journals/resource/954925225013