Two-Color Grating Magneto-Optical Trap for Narrow-Line Laser Cooling

authored by: S. Bondza, C. Lisdat, S. Kroker, T. Leopold
Abstract: We demonstrate the two-color cooling and trapping of alkaline-earth atoms in a grating magneto-optical trap (GMOT). The trap is formed by a single incident laser beam together with four secondary beams that are generated via diffraction from a nanostructured wafer. A grating structure for a GMOT operating with strontium atoms is optimized and fabricated. We trap 10688Sr atoms on the 1S0→1P1 transition at 461nm and transfer 25% of these atoms to the second cooling stage on the narrower 1S0→3P1 intercombination transition at 689nm, preparing a sample of 2.5×105 atoms at 5μK. These results demonstrate the applicability of the GMOT technology in conjunction with two widely differing wavelengths and enable the continued miniaturization of alkaline-earth-based quantum technologies like optical atomic clocks.
External Organisation(s): National Metrology Institute of Germany (PTB)
DLR-Institute for Satellite Geodesy and Inertial Sensing
Technische Universität Braunschweig
Laboratory for Emerging Nanometrology Braunschweig (LENA)
Type: Article
Journal: Physical review applied
Volume: 17
ISSN: 2331-7019
Publication date: 01.04.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.1103/physrevapplied.17.044002 (Access: Open)

BibTeX

@article{e6a5bca8619344c6b5b9b789edd155df,
title = "Two-Color Grating Magneto-Optical Trap for Narrow-Line Laser Cooling",
abstract = "We demonstrate the two-color cooling and trapping of alkaline-earth atoms in a grating magneto-optical trap (GMOT). The trap is formed by a single incident laser beam together with four secondary beams that are generated via diffraction from a nanostructured wafer. A grating structure for a GMOT operating with strontium atoms is optimized and fabricated. We trap 10688Sr atoms on the 1S0→1P1 transition at 461nm and transfer 25% of these atoms to the second cooling stage on the narrower 1S0→3P1 intercombination transition at 689nm, preparing a sample of 2.5×105 atoms at 5μK. These results demonstrate the applicability of the GMOT technology in conjunction with two widely differing wavelengths and enable the continued miniaturization of alkaline-earth-based quantum technologies like optical atomic clocks.",
author = "S. Bondza and C. Lisdat and S. Kroker and T. Leopold",
note = "Funding information: We thank Kathrin St{\"o}rr and Thomas Weimann for the fabrication of the grating chip, Carsten Feist for laser cutting of the wafer and Matthias Wurm for characterization of the grating with scatterometry measurements. We would further like to thank Frank Fuchs/Gitterwerk GmbH for providing the RCWA code Moose. This work is financially supported by the State of Lower-Saxony through the VW Vorab and DLR, project D/123/67284017. We further acknowledge support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy—EXC-2123 QuantumFrontiers—Project-ID 390837967 and SFB 1464 TerraQ—Project-ID 434617780—within project A04.",
year = "2022",
month = apr,
day = "1",
doi = "10.1103/physrevapplied.17.044002",
language = "English",
volume = "17",
journal = "Physical review applied",
issn = "2331-7019",
publisher = "American Physical Society",
number = "4",
}