Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 27.24: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Laser stabilization for high-precision spectroscopy of highly charged ions using an ultra-stable optical reference cavity — •Devanarayanan Rajeeb Kumar, Ruben B. Henninger, Elwin A. Dijck, Shreya Rao Kodancha, Sebastian Davidson, Vera M. Schäfer, José R. Crespo López-Urrutia, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg
Frequency metrology of clock transitions requires lasers of sub-hertz linewidth and exceptional frequency stability. For our work with highly charged ions, an ultra-stable, high finesse optical reference cavity was developed and is operated near room temperature to stabilize our lasers. Our ultra-low-expansion glass Fabry-Pérot etalon achieves a projected noise floor of 3.6× 10−16 relative frequency uncertainty at 1 second - approaching that of state-of-the-art cryogenic silicon cavities. Additional stabilization techniques are implemented to suppress residual technical noise: Fiber-induced phase noise is actively canceled, laser power is stabilized to improve the fidelity of the cavity lock, and residual amplitude modulation is minimized through active control of the electro-optical modulator operating point. A frequency comb is then phase-locked to the cavity stabilized laser which enables low-noise frequency transfer to a spectroscopy laser. The resulting stabilized laser system should provide the stringent frequency stability and linewidth requirements needed for highly charged ion spectroscopy.
Keywords: Fiber noise cancellation; Residual amplitude modualtion; Optical reference cavity; Highly charged ion spectroscopy; Noise stabilization.