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APS

Cs-Cs Scattering in a Juggling Fountain

Ronald Legere, Kurt Gibble

Published May 1, 1998• 0 citations
OpenAlex

Abstract

Summary form only given. We juggle atoms in an atomic fountain by launching two balls of laser-cooled Cs atoms in rapid succession. The two balls collide near the top of the fountain trajectory, and we detect the velocity of the scattered atoms, giving information on the differential scattering cross section.

Related papers

Cs-Cs scattering in a juggling fountain

Ronald Legere, Kurt Gibble

Summary form only given. We juggle atoms in an atomic fountain by launching two balls of laser-cooled Cs atoms in rapid succession. The two balls collide near the top of the fountain trajectory, and we detect the velocity of the scattered atoms, giving information on the differential scattering cross section.

Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations

Laser-cooled Rb clocks and juggling atomic fountains

Kurt Gibble

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

Quantum Scattering in a Juggling Atomic Fountain

Ronald Legere, Kurt Gibble

We demonstrate a juggling atomic fountain by launching two laser-cooled balls of ${}^{133}\mathrm{Cs}$ atoms in rapid succession. The atoms collide near the top of the fountain and, by varying the delay between launches, we scan the collision energy from 19 to $150\ensuremath{\mu}\mathrm{K}$. We measure the differential scattering cross section and isolate the contributions from different partial waves including their interferences. We observe the $s$-wave energy dependence and the $p$-wave scattering threshold. We infer a triplet $s$-wave scattering length of ${\ensuremath{-}400a}_{0}$ and a $p$ wave of $({\ensuremath{-}107a}_{0}{)}^{3}$ for $|F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4,m\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4〉+|3,3〉$.

Physical Review Letters•Dec 28, 1998•106 citations

Laser-cooled Rb clocks

Chad Fertig, Ronald Legere, W. Suptitz +1 more

The authors present a preliminary measurement of the cold collision shift for /sup 87/Rb where they found the shift to be more than a factor of 10 smaller than that of a laser-cooled Cs clock. They also discuss calculations for /sup 85/Rb and demonstrate a juggling fountain. Juggling fountain clocks can achieve higher stability without requiring large improvements in the local oscillator. In this first Cs juggling experiment, the effects of collisions between juggled balls of atoms are studied.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Nov 27, 2002•0 citations

Juggling atomic clocks

Chad Fertig, Kurt Gibble

We demonstrate a prototype of a laser-cooled 87Rb fountain clock and measure the frequency shift due to cold collisions. The shift is 30 times smaller than that in a laser-cooled Cs clock. We observe a density dependent pulling by the microwave cavity and use it to cancel the collision shift. We have also demonstrated a juggling atomic fountain to study cold collisions and we discuss the importance ofjuggling for future fountain clocks.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 15, 2000•0 citations

Direct Observation of s -Wave Atomic Collisions

Kurt Gibble, Seongsik Chang, Ronald Legere

We observe the angular distribution of $s$-wave scattering of Cs atoms in an atomic fountain by selecting and probing atomic velocities. At an average temperature of $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.89$ $\ensuremath{\mu}$K the scattering is predominantly $s$-wave and we have a sensitivity to $p$-wave cross sections as small as 0.1% of the $s$-wave. The cross section is $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}\phantom{\rule{0ex}{0ex}}{\mathrm{cm}}^{2}$ for atoms in the $F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$, ${m}_{F}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ state colliding with atoms distributed among the $F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$, ${m}_{F}$ states. We also demonstrate a multiply loaded magneto-optic trap and a temperature of 1.53(7) $\ensuremath{\mu}$K.

Physical Review Letters•Oct 2, 1995•84 citations
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.
We demonstrate a juggling atomic fountain by launching two laser-cooled balls of 133Cs{}^{133}\mathrm{Cs}133Cs atoms in rapid succession. The atoms collide near the top of the fountain and, by varying the delay between launches, we scan the collision energy from 19 to $150\ensuremath{\mu}\mathrm{K}$. We measure the differential scattering cross section and isolate the contributions from different partial waves including their interferences. We observe the sss-wave energy dependence and the ppp-wave scattering threshold. We infer a triplet sss-wave scattering length of ${\ensuremath{-}400a}_{0}$ and a ppp wave of $({\ensuremath{-}107a}_{0}{)}^{3}$ for ∣F=4,m=4〉+∣3,3〉|F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4,m\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4〉+|3,3〉∣F=4,m=4〉+∣3,3〉.
We observe the angular distribution of sss-wave scattering of Cs atoms in an atomic fountain by selecting and probing atomic velocities. At an average temperature of T=0.89T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.89T=0.89 $\ensuremath{\mu}$K the scattering is predominantly sss-wave and we have a sensitivity to ppp-wave cross sections as small as 0.1% of the sss-wave. The cross section is $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}\phantom{\rule{0ex}{0ex}}{\mathrm{cm}}^{2}$ for atoms in the F=3F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3F=3, mF=0{m}_{F}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0mF​=0 state colliding with atoms distributed among the F=4F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4F=4, mF{m}_{F}mF​ states. We also demonstrate a multiply loaded magneto-optic trap and a temperature of 1.53(7) $\ensuremath{\mu}$K.