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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

A juggling Rb fountain clock and a direct measurement of population differences

Chad Fertig, J.I. Rees, Kurt Gibble

Published Nov 13, 2002• 5 citations
Publisher

Abstract

We demonstrate a new atomic state detection scheme that directly measures the population difference of the two clock states using FM absorption spectroscopy. We also demonstrate a juggling Rb fountain clock that we will use to study collisions of juggled balls of atoms. Juggling can significantly improve the clocks short-term stability without requiring greater signal-to-noise or a larger cold collision frequency shift.

DOI
10.1109/freq.2001.956153

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Summary form only given. We juggle atoms in an atomic fountain by launching 2 balls of laser-cooled Cs atoms in rapid succession. The 2 balls collide near the top of the fountain and we detect the scattered atoms by measuring the changes in the atoms vertical velocity. Measuring the distribution of the velocity component along the collision axis gives the differential cross section. We scan the collision energy E/sub c/ by varying the time delay between launches and get the differential cross sections as a function of energy.

Quantum Electronics and Laser Science Conference•Jan 20, 2003•0 citations
We demonstrate a new atomic state detection scheme that directly measures the population difference of the two clock states using FM absorption spectroscopy. We also demonstrate a juggling Rb fountain clock that we will use to study collisions of juggled balls of atoms. Juggling can significantly improve the clocks short-term stability without requiring greater signal-to-noise or a larger cold collision frequency shift.
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