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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.6: Poster

Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof

Spatial coherence properties of laser-triggered electron pulses towards higher currents — •Stefan Meier and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

Tungsten needle tips represent well-suited electron sources for various applications, like electron microscopy or holography. In cold field emission, these tips provide a highly coherent electron beam, a key parameter for any electron-optical application. When ultrashort femtosecond laser pulses are focused on the tip, the electron emission can occur on timescales down to a few femtoseconds, leading to an ultrafast pulsed electron source. In recent experiments, we could show that the pulsed electron emission is spatially as coherent as cold field emission from the same tip [1]. Usually, femtosecond laser-triggered emission currents are below one electron per laser pulse to avoid electron-electron interaction within the small emission area and time. In this work, we investigate the properties of the spatial coherence towards one electron per pulse and show the current progress.

[1] S. Meier et al., Appl. Phys. Lett. 113, 143101 (2018).