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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 27.23: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

Monolithic frequency doubling cavities for Beryllium photoionization — •Anton J. Sterr, Magdalena Winkelvoss, Stepan Kokh, Sophia Dorra, Melina Gizewski, Finja Mayer, Maili Schube, José R. Crespo López-Urrutia, Thomas Pfeifer, and Vera M. Schäfer — Max-Planck-Institut für Kernphysik, Heidelberg

High-precision spectroscopy of optical transitions in Cf¹⁵⁺ and Cf¹⁷⁺ is a promising tool to search for variations of the fine structure constant [1]. To extract information from the californium ions, they are co-trapped with a singly charged beryllium logic ion.

Beryllium is ionized via two-photon absorption that requires a continuous wave laser source at 235 nm. Building on an existing approach [2], two monolithic cavities are designed to quadruple the frequency of an infrared source at 940 nm using periodically poled KTP and BBO crystals. We target at least 50 mW of UV power for a source of 1 W. To achieve optimum conversion efficiency, simulations for different cavity geometries are performed, taking thermal lensing effects into account. We present power measurements and locking performance of the first doubling stage.

[1] Kozlov, et al., Rev. Mod. Phys. 90, 045005 (2018)

[2] Hannig, et al., Rev. Sci. Instrum. 89, 013106 (2018)

Keywords: SHG; Cavity; Beryllium