dorsal/arxiv
View SchemaHelium 2 3S - 2 1S metrology at 1557 nm
| Authors | K. A. H. van Leeuwen, W. Vassen |
|---|---|
| Categories | |
| ArXiv ID | physics/0609087 |
| URL | https://arxiv.org/abs/physics/0609087 |
| DOI | 10.1209/epl/i2006-10284-4 |
Abstract
An experiment is proposed to excite the 'forbidden' 1s2s 3S1 - 1s2s 1S0 magnetic dipole (M1) transition at 1557 nm in a collimated and slow atomic beam of metastable helium atoms. It is demonstrated that an excitation rate of 5000 /s can be realised with the beam of a 2W narrowband telecom fiber laser intersecting the atomic beam perpendicularly. A Doppler-limited sub-MHz spectroscopic linewidth is anticipated. Doppler-free excitation of 2% of trapped and cooled atoms may be realised in a one-dimensional optical lattice geometry, using the 2W laser both for trapping and spectroscopy. The very small (8 Hz) natural linewidth of this transition presents an opportunity for accurate tests of atomic structure calculations of the helium atom. A measurement of the 3He - 4He isotope shift allows for accurate determination of the difference in nuclear charge radius of both isotopes.
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"abstract": "An experiment is proposed to excite the \u0027forbidden\u0027 1s2s 3S1 - 1s2s 1S0\nmagnetic dipole (M1) transition at 1557 nm in a collimated and slow atomic beam\nof metastable helium atoms. It is demonstrated that an excitation rate of 5000\n/s can be realised with the beam of a 2W narrowband telecom fiber laser\nintersecting the atomic beam perpendicularly. A Doppler-limited sub-MHz\nspectroscopic linewidth is anticipated. Doppler-free excitation of 2% of\ntrapped and cooled atoms may be realised in a one-dimensional optical lattice\ngeometry, using the 2W laser both for trapping and spectroscopy. The very small\n(8 Hz) natural linewidth of this transition presents an opportunity for\naccurate tests of atomic structure calculations of the helium atom. A\nmeasurement of the 3He - 4He isotope shift allows for accurate determination of\nthe difference in nuclear charge radius of both isotopes.",
"arxiv_id": "physics/0609087",
"authors": [
"K. A. H. van Leeuwen",
"W. Vassen"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1209/epl/i2006-10284-4",
"title": "Helium 2 3S - 2 1S metrology at 1557 nm",
"url": "https://arxiv.org/abs/physics/0609087"
},
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