Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser
| Autor: | R. Kiessling, W. B. Colson, S. Gewinner, W. Schöllkopf, M. Wolf, A. Paarmann |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review Accelerators and Beams, Vol 21, Iss 8, p 080702 (2018) |
| Druh dokumentu: | article |
| ISSN: | 2469-9888 47175885 |
| DOI: | 10.1103/PhysRevAccelBeams.21.080702 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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