Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Ultrashort Laser Pulses
Q 39.3: Vortrag
Mittwoch, 13. März 2019, 14:45–15:00, S SR 211 Maschb.
Sub-two cycle laser sources around 800 nm and 1560 nm for strong-field photoemission from metallic needle tips — •Philip Dienstbier1, Timo Paschen1, Lennart Seiffert2, Thomas Fennel2, and Peter Hommelhoff1 — 1Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany — 2Institute of Physics, University of Rostock, Rostock, Germany
In order to study photoemission dynamics in the strong-field regime few-cycle laser pulses are required. Such pulses have been used to investigate field-driven electron dynamics in photoemission from needle tips by changing the carrier-envelope phase (CEP) [1]. To enhance temporal resolution, we shorten pulses around 800 nm from 6 fs to sub 4 fs duration in a CEP-stable manner. We achieve this by spectrally broadening the output of a Ti:Sapphire oscillator in an all-normal dispersive photonic crystal fiber and compression with a 4f pulse shaper. Another approach for studying the coherent dynamics is a two-color scheme with strong driving pulses around 1560 nm, where the optical phase between this driving pulse and its second harmonic is predicted to modulate the photocurrent due to trajectory manipulation [2]. To obtain sub-two cycle pulses around 1560 nm, the output of an Erbium-doped fiber is spectrally broadened and compressed in a highly nonlinear fiber before its phase-locked second harmonic is generated. We will report on this two-color scheme and present initial data.
[1] M. Krüger et al., Nature 475, 78-81 (2011).
[2] L. Seiffert et al., J. Phys. B 51, 13 (2018).