Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 23.3: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Upconversion of infrared free-electron laser light in gallium selenide — •Riko Kießling, Sandy Gewinner, Wieland Schöllkopf, Martin Wolf, and Alexander Paarmann — Fritz-Haber-Institut der MPG, Berlin

For absolute timing synchronization with sub-picosecond accuracy between table-top and accelerator-based free-electron lasers (FELs), it is essential to develop efficient schemes for relative timing measurements [1]. Specifically, for the synchronization between an FEL tunable throughout the mid-infrared frequency region [2] and a near-infrared table-top laser, light upconversion by sum-frequency generation could provide sufficient sensitivity for online-timing measurements.

As a first step, we have investigated the sum-frequency generation in gallium selenide by mixing the picosecond FEL pulses with near-infrared nanosecond pulses from a Nd:YAG laser. The conversion process is explored in terms of phase-matching and azimuthal angle dependence, polarization orientations and intensity scaling over a broad spectral range, utilizing the tunability of the FEL. Gallium selenide presents itself as an efficient nonlinear medium in the infrared, allowing its application to determine the absolute timing between the FEL and femtosecond table-top laser pulses.

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

[2] W. Schöllkopf et al., Proc. SPIE 9512, 95121L (2015)