Quenched narrow-line second- and third-stage laser cooling of 40Ca

We demonstrate three-dimensional (3-D) quenched narrow-line laser cooling and trapping of 40Ca. With 5 ms of cooling time we can transfer 28 % of the atoms from a magneto-optic trap based on the strong 423 nm cooling line to a trap based on the narrow 657 nm clock transition (that is quenched by an...

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Bibliographic Details
Published inarXiv.org
Main Authors Curtis, E Anne, Oates, Christopher W, Hollberg, Leo
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 20.08.2002
Subjects
Calcium isotopes
Cooling
Frequency standards
Laser cooling
Optical frequency
Quenching
Recoil
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Summary:We demonstrate three-dimensional (3-D) quenched narrow-line laser cooling and trapping of 40Ca. With 5 ms of cooling time we can transfer 28 % of the atoms from a magneto-optic trap based on the strong 423 nm cooling line to a trap based on the narrow 657 nm clock transition (that is quenched by an intercombination line at 552 nm), thereby reducing the atoms' temperature from 2 millikelvin to 10 microkelvin. This reduction in temperature should help reduce the overall systematic frequency uncertainty for our Ca optical frequency standard to < 1 Hz. Additional pulsed, quenched narrow-line third-stage cooling in 1-D yields sub-recoil temperatures as low as 300 nK, and makes possible the observation of high-contrast two-pulse Ramsey spectroscopic lineshapes.
ISSN:2331-8422
DOI:10.48550/arxiv.0208071