Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser
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-...
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American Physical Society
2018-08-01
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Series: | Physical Review Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.21.080702 |
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doaj-3c6f37c819b444b58dcb47175885a3202020-11-24T21:32:23ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882018-08-0121808070210.1103/PhysRevAccelBeams.21.080702Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laserR. KiesslingW. B. ColsonS. GewinnerW. SchöllkopfM. WolfA. PaarmannWe 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 100 fs 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 micropulse resolution, providing full access to the IR FEL pulse shape evolution within the macropulse. These measurements provide unprecedented insights into the occurrence of limit-cycle oscillations of the FEL intensity as a consequence of subpulse 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.http://doi.org/10.1103/PhysRevAccelBeams.21.080702 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
R. Kiessling W. B. Colson S. Gewinner W. Schöllkopf M. Wolf A. Paarmann |
spellingShingle |
R. Kiessling W. B. Colson S. Gewinner W. Schöllkopf M. Wolf A. Paarmann Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser Physical Review Accelerators and Beams |
author_facet |
R. Kiessling W. B. Colson S. Gewinner W. Schöllkopf M. Wolf A. Paarmann |
author_sort |
R. Kiessling |
title |
Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
title_short |
Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
title_full |
Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
title_fullStr |
Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
title_full_unstemmed |
Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
title_sort |
femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2018-08-01 |
description |
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 100 fs 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 micropulse resolution, providing full access to the IR FEL pulse shape evolution within the macropulse. These measurements provide unprecedented insights into the occurrence of limit-cycle oscillations of the FEL intensity as a consequence of subpulse 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. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.21.080702 |
work_keys_str_mv |
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