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arXiv:1201.3856

An ultraviolet laser system for laser cooling and trapping of metastable magnesium

A. P. Kulosa, J. Friebe, Matthias Riedmann, Pape, A., Temmo Wübbena, Dominika Fim, Steffen Rühmann, Klaus Zipfel, Hrishikesh Kelkar, Wolfgang A. Ertmer, Ernst Maria Rasel

Published Jan 18, 2012• 0 citations
arXivHTMLPDF

Abstract

We report on a reliable laser system for cooling magnesium atoms in the metastable 3P manifold. The three relevant transitions coupling the 3P to the 3D manifold are near 383 nm and seperated by several hundred GHz. The laser system consists of three diode lasers at 766 nm. All lasers are frequency stabilised to a single pre-stabilised transfer cavity. The applied scheme for frequency control greatly reduces the complexity of operating three lasers combined with resonant frequency doubling stages and provides a high reliability necessary for complex atomic physics experiments.

DOI
10.48550/arxiv.1201.3856

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We report on a reliable laser system for cooling magnesium atoms in the metastable 3P manifold. The three relevant transitions coupling the 3P to the 3D manifold are near 383 nm and seperated by several hundred GHz. The laser system consists of three diode lasers at 766 nm. All lasers are frequency stabilised to a single pre-stabilised transfer cavity. The applied scheme for frequency control greatly reduces the complexity of operating three lasers combined with resonant frequency doubling stages and provides a high reliability necessary for complex atomic physics experiments.
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A laser system with a narrow generation line for secondary laser cooling of 87 Sr atoms has been developed and investigated. It is planned to use ultracold 87 Sr atoms loaded in an optical lattice in an optical frequency standard. To this end, a 689-nm semiconductor laser has been stabilised using an external reference ultrastable cavity with vibrational and temperature compensation near the critical point. The lasing spectral width was 80 Hz (averaging time 40 ms), and the frequency drift was at a level of 0.3 Hz s -1 . Comparison of two independent laser systems yielded a minimum Allan deviation: 2 × 10 -14 for 300-s averaging. It is shown that this system satisfies all requirements necessary for secondary cooling of 87Sr atoms using the spectrally narrow 1 S 0 — 3 P 1 transition (λ = 689 nm).