Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Poster – Highly Charged Ions and their Applications

A 37.3: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

An ultra-stable optical reference cavity for spectroscopy of highly charged ions — •Ruben B. Henninger, Elwin A. Dijck, Vera M. Schäfer, Christian Warnecke, Stepan Kokh, Andrea Graf, José R. Crespo López-Urrutia, and Thomas Pfeifer — Max Planck Institut für Kernphysik, Saupfercheckweg 1, Heidelberg, Germany

To investigate the potential existence of a fifth force influencing interactions between electrons and neutrons, our research aims to employ highly charged ions (HCIs). In particular xenon, with its numerous spin-zero isotopes, represents a promising candidate for this investigation. The use of narrow linewidth lasers in the sub-Hertz regime is essential for achieving the required precision for the identification of new physics. This poster introduces an optical reference cavity with a 10 cm ULE spacer intended to stabilize spectroscopy lasers for different ions. We theoretically investigate the influence of crystalline mirror substrates on the thermal noise floor of the cavity and build a system with a projected noise floor of 3.6e-16 relative frequency uncertainty at one second. We present the design of the cavity housing and characterization measurements.

Keywords: Highly charged ions; Precision spectroscopy; Ultra stable laser; Reference Cavity