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Erlangen 2022 – scientific programme

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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: Talk

Thursday, March 17, 2022, 11:45–12:00, A-H3

Two-color grating magneto-optical trap for narrow-line laser cooling — •Saskia Anna Bondza1,2, Christian Lisdat1, Stefanie Kroker3,4,1, and Tobias Leopold211Physikalisch-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 106 88Sr atoms on the 1S01P1 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 1S03P1 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.

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