Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 85: Vacuum Science & Technology: Theory and Applications II

O 85.4: Vortrag

Donnerstag, 12. März 2026, 16:00–16:15, HSZ/0401

Cross-correlation measurements of a Two-Color Infrared Free-Electron Laser — •Akash Chandra Behera, América Yareth Torres Boy, Sandy Gewinner, Marco De Pas, Gert von Helden, Martin Wolf, Wieland Schöllkopf, Gerard Meijer, and Alexander Paarmann — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Infrared-Free Electron Lasers (IR-FEL) uniquely provide high-power narrowband radiation for spectroscopic measurements, that is continuously tunable from the mid-IR to the terahertz spectral range.

The IR-FEL at the Fritz Haber Institute recently commissioned a two-color upgrade, enabling simultaneous lasing at two independently tunable wavelengths. This is realized by employing a high-frequency kicker cavity to feed alternating electron bunches into the two separate undulators. Within this scheme, a high intrinsic temporal synchronization between both FEL outputs is expected.

In our contribution, we present two-color optical cross correlation measurements proving this synchronization. By leveraging the independently tunable pulse durations in each FEL, we further explore the achievable time-resolution that can be expected when the two-color FEL is employed for future IR-IR pump-probe experiments

Keywords: Free-electron laser; Laser synchronization; Optical Cross-correlation