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 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 106 88Sr 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.