SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 27: Poster III

A 27.31: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Passive vibration reduction of a femtosecond enhancement cavity — •Lukas Matt, Jan-Hendrik Oelmann, Tobias Heldt, Lennart Guth, Janko Nauta, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

To perform spectroscopy of highly charged ions in the extreme ultraviolet (XUV), we developed an XUV-frequency comb [1]. Since high intensities are necessary for the high-harmonic generation producing the XUV and a high repetition rate of 100 MHz needs to be maintained, the use of an enhancement cavity is necessary. Which is vibration sensitive, because the cavity length has to be hold on resonance. Therefore the cavity has to be build very stable and decoupled from the noisy turbomolecular pumps. As no rigid connection between vacuum chamber and optical table is allowed, the realtive position between both has to be monitored, to avoid contact that would lead to vibrational coupling. We accomplish that with 6 laser-distance sensors. We present the technical realisation of this system. [1] (J. Nauta, A. Borodin, H. B. Ledwa, J. Stark, M. Schwarz, L. Schmöger, P. Micke, J. R. Crespo López-Urrutia and T. Pfeiffer, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 408, 285 (2017))