Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 4: Plasmonics and Nanooptics I: Light-Matter Interactions

O 4.7: Talk

Monday, March 20, 2017, 12:00–12:15, TRE Ma

Temporal characteristics of intense tunable pulses from an infrared free-electron laser — •Riko Kießling, Sandy Gewinner, Wieland Schöllkopf, Martin Wolf, and Alexander Paarmann — Fritz-Haber-Institut der MPG, Berlin

For the generation of coherent radiation in the infrared region, the free-electron laser (FEL) posseses unique properties regarding intensity, wavelength tunability and short pulse durations. Covering the spectral range from 3 to 50 µm, the IR FEL at the Fritz Haber Institute is dedicated to (non-)linear spectroscopy of vibrational resonances in molecules, clusters and solid matter.

Here, we present the first cross-correlation measurements of the ps FEL pulses with a synchronized fs fiber oscillator via sum-frequency generation in nonlinear media. The observed FEL pulse intensity envelope confirms a lasing behavior typical for oscillator-type FELs [1]. Also, the influence of the FEL cavity detuning on the temporal shape, duration and fluctuation of the IR pulse is discussed. Using a differential cross-correlation scheme [2] will allow the exact determination of the absolute timing between accelerator-based and table-top optical pulses, which enables time-resolved studies of FEL-induced transient processes in solid-state systems.

[1] Knippels et al., PRL 83, 1578 (1999)

[2] Schulz et al., Nat. Commun. 6, 5938 (2015)