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Berlin 2001 – wissenschaftliches Programm

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Q: Quantenoptik

Q 17: Poster: Cooling and Trapping

Q 17.21: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT2

Cooling of Calcium to the recoil limit — •Tomas Binnewies, Guido Wilpers, Uwe Sterr, Fritz Riehle, and Jürgen Helmcke — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

The narrow linewidths of the intercombination transitions 1S03P1 of alkaline earth atoms allow novel applications and basic research e. g. for optical clocks or cold collision physics. This transition has been successfully used to prepare ultracold ensembles of Sr atoms [1]. To make use of the twenty times smaller linewidth in Ca due to the weak associated cooling force a modification of the cooling scheme is required. The method uses a repumping laser on the 4s4p 3P1 – 4s4d 1D2 transition to reduce the lifetime of the 3P1 state thereby increasing the cooling force. The achievable temperature should be limited by the combined recoil limit of the involved transitions, leading to an improvement of two orders of magnitude compared to the current limit, the Doppler limit on the strong cooling transition 4s2 1S0 – 4s4p 1P1. We present theoretical and experimental investigations on this cooling scheme and discuss the perspectives of ultracold atomic ensembles for atom interferometry and frequency standards.
Supported by the DFG under SFB 407.
[1] H. Katori et al, Phys. Rev. Lett. 82, 1116 (1999)

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