Sub-Doppler magneto-optical trap for calcium
2002; American Physical Society; Volume: 65; Issue: 4 Linguagem: Inglês
10.1103/physreva.65.041401
ISSN1538-4446
AutoresJan Grünert, Andreas Hemmerich,
Tópico(s)Quantum Information and Cryptography
ResumoWe explore an efficient method for preparing large samples of ultracold calcium atoms. An optimized conventional (Doppler-limited) magneto-optical trap collects atoms from a Zeeman cooled atomic beam using a strong dipole transition within the singlet system. This transition is not completely closed thus yielding an intense flux of atoms into the metastable triplet state ${}^{3}{P}_{2}.$ A second magneto-optical trap sharing the same magnetic-field gradient is superimposed which captures and further cools the metastables using the narrow-band infrared transition ${}^{3}{\stackrel{\ensuremath{\rightarrow}}{{P}_{2}}}^{3}{D}_{3}.$ In our present experiment we were able to prepare $3\ifmmode\times\else\texttimes\fi{}{10}^{8}$ atoms at temperatures below 20 microkelvin within 250 ms. Minor technical improvements of our setup promise to yield above ${10}^{10}$ atoms at submicrokelvin temperatures within 1 s.
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