Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy

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dc.creatorEyler, E. E.
dc.creatorChieda, D. E.
dc.creatorStowe, Matthew C.
dc.creatorThorpe, Michael J.
dc.creatorSchibli, T. R.
dc.creatorYe, Jun
dc.date2007-04-25
dc.date2007-07-11
dc.date.accessioned2026-07-07T09:45:43Z
dc.date.available2026-07-07T09:45:43Z
dc.descriptionWe analyze several possibilities for precisely measuring electronic transitions in atomic helium by the direct use of phase-stabilized femtosecond frequency combs. Because the comb is self-calibrating and can be shifted into the ultraviolet spectral region via harmonic generation, it offers the prospect of greatly improved accuracy for UV and far-UV transitions. To take advantage of this accuracy an ultracold helium sample is needed. For measurements of the triplet spectrum a magneto-optical trap (MOT) can be used to cool and trap metastable 2^3S state atoms. We analyze schemes for measuring the two-photon $2^3S \to 4^3S$ interval, and for resonant two-photon excitation to high Rydberg states, $2^3S \to 3^3P \to n^3S,D$. We also analyze experiments on the singlet-state spectrum. To accomplish this we propose schemes for producing and trapping ultracold helium in the 1^1S or 2^1S state via intercombination transitions. A particularly intriguing scenario is the possibility of measuring the $1^1S \to 2^1S$ transition with extremely high accuracy by use of two-photon excitation in a magic wavelength trap that operates identically for both states. We predict a ``triple magic wavelength'' at 412 nm that could facilitate numerous experiments on trapped helium atoms, because here the polarizabilities of the 1^1S, 2^1S and 2^3S states are all similar, small, and positive.
dc.descriptionShortened slightly and reformatted for Eur. Phys. J. D
dc.identifierhttps://arxiv.org/abs/0704.3430
dc.identifierhttp://arxiv.org/abs/0704.3430
dc.identifierEur. Phys. J. D 48, 43-55 (2008)
dc.identifierdoi:10.1140/epjd/e2007-00289-y
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163291
dc.subjectAtomic Physics
dc.titleProspects for precision measurements of atomic helium using direct frequency comb spectroscopy
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