Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser
Autor: | Riko Kiessling, Wieland Schöllkopf, Sandy Gewinner, Alexander Paarmann, Martin Wolf, W. B. Colson |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous) Infrared 02 engineering and technology 01 natural sciences law.invention Optics law 0103 physical sciences lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Jitter Physics business.industry Free-electron laser Surfaces and Interfaces 021001 nanoscience & nanotechnology Laser Pulse (physics) Picosecond Femtosecond Cathode ray lcsh:QC770-798 Physics::Accelerator Physics 0210 nano-technology business |
Zdroj: | Physical Review Accelerators and Beams Physical Review Accelerators and Beams, Vol 21, Iss 8, p 080702 (2018) |
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 \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. |
Databáze: | OpenAIRE |
Externí odkaz: |