Narrow-line magneto-optical trap of titanium atoms
Abstract
We realize narrow-linewidth magneto-optical traps of 46Ti, 48Ti and 50Ti atoms based on a 1040 nm-wavelength transition, cooling atoms to a minimum temperature in one dimension of Tz=990(20) nK and a three-dimensional temperature of T3D=1.28(7) μK. Atoms are pre-cooled in a broad-line magneto-optical trap and then transferred with about 25% efficiency to the narrow-line trap. We operate the narrow-line trap in two stages over 85 ms. First, a single cooling beam, blue-detuned from the narrow-linewidth atomic resonance, optically pumps and traps the atoms on a two-dimensional surface where the Zeeman shift from the applied spherical quadrupole magnetic field brings the light nearly to resonance. Second, four additional beams, counter-propagating in the transverse directions, cool and compress the atoms in all dimensions. The high magnetic moment of the laser cooling state makes the dynamics of the narrow-line titanium trap similar to those of other magnetic atoms. We measure the lifetime of the excited state of the transition to be τ=8.2(9) μs, indicating a transition linewidth of γ/2π=20(2) kHz, and also measure isotope shifts on the narrow-line transition. We use Stern-Gerlach separation on the ultracold Ti gas to measure the mJ-distribution in the narrow-line magneto-optical trap, finding over 98% of the atoms in the stretched spin state.
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BibTeX
@misc{duim2026narrowline,
title = {{Narrow-line magneto-optical trap of titanium atoms}},
author = {Rowan Duim and Scott Eustice and Jackson Schrott and Hiromitsu Sawaoka and Dan M. Stamper-Kurn},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.10725},
eprint = {2609.10725},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.10725},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Narrow-line magneto-optical trap of titanium atoms
AU - Rowan Duim
AU - Scott Eustice
AU - Jackson Schrott
AU - Hiromitsu Sawaoka
AU - Dan M. Stamper-Kurn
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2609.10725
UR - https://arxiv.org/abs/2609.10725
AB - We realize narrow-linewidth magneto-optical traps of ^46Ti, ^48Ti and ^50Ti atoms based on a 1040 nm-wavelength transition, cooling atoms to a minimum temperature in one dimension of T_z=990(20) nK and a three-dimensional temperature of T_3D=1.28(7) μK. Atoms are pre-cooled in a broad-line magneto-optical trap and then transferred with about 25% efficiency to the narrow-line trap. We operate the narrow-line trap in two stages over 85 ms. First, a single cooling beam, blue-detuned from the narrow-linewidth atomic resonance, optically pumps and traps the atoms on a two-dimensional surface where the Zeeman shift from the applied spherical quadrupole magnetic field brings the light nearly to resonance. Second, four additional beams, counter-propagating in the transverse directions, cool and compress the atoms in all dimensions. The high magnetic moment of the laser cooling state makes the dynamics of the narrow-line titanium trap similar to those of other magnetic atoms. We measure the lifetime of the excited state of the transition to be τ=8.2(9) μs, indicating a transition linewidth of γ/2π=20(2) kHz, and also measure isotope shifts on the narrow-line transition. We use Stern-Gerlach separation on the ultracold Ti gas to measure the m_J-distribution in the narrow-line magneto-optical trap, finding over 98% of the atoms in the stretched spin state.
ER -