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A: Fachverband Atomphysik
A 42: Atomic Systems in External Fields II
A 42.7: Vortrag
Freitag, 6. März 2026, 12:30–12:45, N 3
Lithium Faraday Filter — •Maximilian Luka, Yijun Wang, Denis Uhland, and Ilja Gerhardt — light & matter group, Institute of Solid State Physics, Leibniz University Hannover, Germany
We report the first experimental realization and theoretical modeling of a lithium-based Faraday filter operating at 671 nm. Lithium’s D-line splitting of approximately 10 GHz, combined with the requirement for operating temperatures above 260 ∘C, positions the system in a regime that is exceptional among alkali metals. A custom-designed heat pipe was developed to ensure stable lithium vapor generation and to enable the application of longitudinal magnetic fields up to 300 G. To accurately model the filter response, we extended the open-source “ElecSus” library to include lithium’s closely spaced D1 and D2 transitions, enabling simultaneous simulation of both lines and direct comparison with experimental data. The modified code reproduces the measured spectra with excellent agreement, predicting and confirming a peak transmission exceeding 80 % under optimized conditions. This work expands the family of alkali-metal Faraday filters and provides a framework for lithium-based optical systems, ranging from precision spectroscopy to atmospheric detection of anthropogenic satellite debris.
Keywords: spectroscopy; optical filtering