A grating-chip atomic fountain

Lewis, Ben and Elvin, Rachel and Arnold, Aidan S. and Riis, Erling and Griffin, Paul F. (2022) A grating-chip atomic fountain. Applied Physics Letters, 121 (16). 164001. ISSN 0003-6951 (https://doi.org/10.1063/5.0115382)

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Cold atom fountain clocks provide exceptional long term stability as they increase interrogation time at the expense of a larger size. We present a compact cold atom fountain using a grating magneto-optical trap (GMOT) to laser cool and launch the atoms in a simplified optical setup. The fountain is evaluated using coherent population trapping and demonstrates improved single-shot stability from the launch. Ramsey times up to 100ms were measured with a corresponding fringe linewidth of 5Hz. This technique could improve both short and long-term stability of cold atom clocks while remaining compact for portable applications.