Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.28: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Development of a HHG frequency comb for XUV metrology of Highly Charged Ions — •Janko Nauta1, Alexander Ackermann1, Julian Stark1, Steffen Kühn1, Andrii Borodin1, Peter Micke2, Lisa Schmöger3, Thomas Pfeifer1, and José Crespo López Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 3Institut für Experimentalphysik ,Universität Innsbruck, Austria
Recent theoretical studies have shown that forbidden optical transitions in highly charged ions (HCI) are the most sensitive systems for probing the variation of the fine structure constant α [1]. Moreover, they have been proposed as novel frequency standards due to their low polarizability and insensitivity to black body radiation [2].
We plan to perform high resolution spectroscopy of cold HCI [2] in the extreme ultraviolet region (XUV), where transitions, from dipole-allowed (E1) to highly forbidden, also take place. To this end, we are developing an enhancement cavity to amplify femtosecond pulses from a phase-stabilized infrared frequency comb at 100 MHz. High-order harmonics will be generated in the tight focus of the cavity, and can be used for direct frequency comb spectroscopy of HCI to determine absolute transition energies.
[1] J. Berengut et al., Phys. Rev. Lett. 109, 070802 (2012)
[2] A. Derevianko et al., Phys. Rev. Lett. 109, 180801 (2012)
[3] L. Schmöger et al., Science 347, 6227 (2015)