Magneto-optical trap for metastable helium at 389 nm
| Autor: | Wim Hogervorst, Wim Vassen, R. J. W. Stas, Jeroen C. J. Koelemeij |
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| Přispěvatelé: | Atoms, Molecules, Lasers |
| Rok vydání: | 2002 |
| Předmět: |
Physics
Atomic Physics (physics.atom-ph) Momentum transfer chemistry.chemical_element FOS: Physical sciences Photoionization Atomic and Molecular Physics and Optics Physics - Atomic Physics chemistry Metastability Ionization Laser cooling Magneto-optical trap Physics::Atomic Physics SDG 7 - Affordable and Clean Energy Atomic physics Loss rate Helium |
| Zdroj: | Koelemeij, J C J, Stas, R J W, Hogervorst, W & Vassen, W 2003, ' Magneto-optical trap for metastable helium at 389 nm ', Physical Review A. Atomic, Molecular and Optical Physics, vol. 67, no. 5, 053406 . https://doi.org/10.1103/PhysRevA.67.053406 Physical Review A. Atomic, Molecular and Optical Physics, 67(5):053406. American Physical Society |
| ISSN: | 1050-2947 |
| DOI: | 10.48550/arxiv.physics/0210060 |
| Popis: | We have constructed a magneto-optical trap (MOT) for metastable triplet helium atoms utilizing the 2 3S1 -> 3 3P2 line at 389 nm as the trapping and cooling transition. The far-red-detuned MOT (detuning Delta = -41 MHz) typically contains few times 10^7 atoms at a relatively high (~10^9 cm^-3) density, which is a consequence of the large momentum transfer per photon at 389 nm and a small two-body loss rate coefficient (2 * 10^-10 cm^3/s < beta < 1.0 * 10^-9 cm^3/s). The two-body loss rate is more than five times smaller than in a MOT on the commonly used 2 3S1 -> 2 3P2 line at 1083 nm. Furthermore, we measure a temperature of 0.46(1) mK, a factor 2.5 lower as compared to the 1083 nm case. Decreasing the detuning to Delta= -9 MHz results in a cloud temperature as low as 0.25(1) mK, at small number of trapped atoms. The 389 nm MOT exhibits small losses due to two-photon ionization, which have been investigated as well. 11 pages |
| Databáze: | OpenAIRE |
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