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Q: Fachverband Quantenoptik und Photonik

Q 50: Precision spectroscopy of atoms and ions III (joint session A/Q)

Q 50.5: Vortrag

Donnerstag, 17. März 2022, 11:45–12:00, A-H3

Two-color grating magneto-optical trap for narrow-line laser cooling — •Saskia Anna Bondza^1,2, Christian Lisdat¹, Stefanie Kroker^3,4,1, and Tobias Leopold² — ¹1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — ²2DLR-Institute for Satellite Geodesy and Inertial Sensing c/o Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — ³Technische Universität Braunschweig, Institut für Halbleitertechnik, Hans-Sommer-Str. 66, 38106 Braunschweig — ⁴LENA Laboratory for Emerging Nanometrology, Langer Kamp 6, 38106 Braunschweig, Germany

We present for the first time design and operation of a two-color grating magneto-optical trap (gMOT) optimized for cooling and trapping of ⁸⁸Sr atoms on the first and second cooling transition. We trap 10^{6 88}Sr atoms on the ¹S₀ → ¹P₁ transition at 461 nm with a linewidth of 30.2 MHz that are initially cooled to few mK and subsequently transferred to the second cooling stage on the narrow line ¹S₀ → ³P₁ transition at 689 nm with a linewidth of 7.48 kHz where they are further cooled to a temperature of 5 µK. We reach a transfer efficiency of 25%. We outline general design considerations for two-colour cooling with a gMOT transferable to other atom species. These results present an important step in further miniaturization of quantum sensors based on cold alkaline-earth atoms.