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Q: Fachverband Quantenoptik und Photonik
Q 59: Precision Measurements and Metrology II (joint session Q/A)
Q 59.6: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Characterization of a Laser System for a Rubidium Two-Photon Frequency Reference — •Daniel Emanuel Kohl1,2, Julien Kluge1,2, Klaus Döringshoff1,2, and Markus Krutzik1,2 — 1Institut f. Physik - Humboldt-Universität zu Berlin — 2Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik
Global navigation satellite systems and deep space navigation require precise clocks with stringent requirements on size, weight and power budgets. Besides advanced RF clocks, optical clocks are envisioned for application in next generation GNSS. Laser spectroscopy of atomic vapor in conjunction with optical frequency combs may provide such compact, high precision frequency standards with fractional instabilities comparable to optical state-of-the-art GNSS systems.
Rubidium offers narrow linewidth two-photon transition at 778 nm from 5S to 5D, which can be detected via monochromatic fluorescence at 420 nm. In this poster, we present a two-photon Rubidium frequency reference featuring an extended cavity diode laser applied to a heated and magnetically shielded vapor cell. With this setup we achieved a fractional frequency instability of 7· 10−13. Recent spectroscopy results will be presented as well as considerations for the most suitable transition within the Manifold. We further report on details of the lasers system including power stabilization and suppression of residual amplitude modulation.
This work is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number 50RK1971.