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Trap induced broadening in a potential hydrogen lattice clock

Scott, J P; Potvliege, R M; Carty, D; Jones, M P A

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Joseph Scott
PGR Student Doctor of Philosophy


We consider the potential use of optical traps for precision measurements in atomic hydrogen (H). Using an implicit summation method, we calculate the atomic polarisability, the rates of elastic/inelastic scattering and the ionisation rate in the wavelength range (395–1000) nm. We extend previous work to predict three new magic wavelengths for the 1S–2S transition. At the magic wavelengths, the 1S–2S transition is unavoidably and significantly broadened due to trap-induced ionisation associated with the high intensity required to trap the 1S state. However, we also find that this effect is partially mitigated by the low mass of H, which increases the trap frequency, enabling Lamb–Dicke confinement in shallow lattices. We find that a H optical lattice clock, free from the motional systematics which dominate in beam experiments, could operate with an intrinsic linewidth of the order of 1 kHz. Trap-induced losses are shown not to limit measurements of other transitions.


Scott, J. P., Potvliege, R. M., Carty, D., & Jones, M. P. A. (2024). Trap induced broadening in a potential hydrogen lattice clock. Metrologia, 61(2), Article 025001.

Journal Article Type Article
Acceptance Date Jan 12, 2024
Online Publication Date Jan 30, 2024
Publication Date 2024-04
Deposit Date Feb 8, 2024
Publicly Available Date Feb 8, 2024
Journal Metrologia
Print ISSN 0026-1394
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 61
Issue 2
Article Number 025001
Keywords precision measurement, optical lattice clock, hydrogen spectroscopy
Public URL


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