Two-tone Doppler cooling of radial two-dimensional crystals in a radio-frequency ion trap

Kato, Alexander; Goel, Apurva; Lee, Raymond; Ye, Zeyu; Karki, Samip; Liu, Jian Jun; Nomerotski, Andrei; Blinov, Boris B.

doi:10.1103/physreva.105.023101

Title: Two-tone Doppler cooling of radial two-dimensional crystals in a radio-frequency ion trap

Journal Article · 03 February 2022 · Physical Review A

DOI: https://doi.org/10.1103/physreva.105.023101 · OSTI ID:1847163

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Univ. of Washington, Seattle, WA (United States)
St. Olaf College, Northfield, MN (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

We study the Doppler-cooling of radial two-dimensional (2D) Coulomb crystals of trapped barium ions in a radiofrequency trap. Ions in radial 2D crystals experience micromotion of an amplitude that increases linearly with the distance from the trap center, leading to a position-dependent frequency modulation of laser light in each ion's rest frame. We use two tones of Doppler-cooling laser light separated by approximately 100 MHz to efficiently cool distinct regions in the crystals with differing amplitudes of micromotion. This technique allows us to trap and cool more than 50 ions populating 4 shells in a radial two-dimensional crystal, where with a single tone of Doppler cooling light we are limited to 30 ions in 3 shells. Here, we also individually characterize the micromotion of all ions within the crystals, and use this information to locate the center of the trap and to determine the Matthieu parameters q_x and q_y.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0012704

OSTI ID:: 1847163

Report Number(s):: BNL-222806-2022-JAAM

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 105; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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