Laser-cooled Cs frequency standard and a measurement of the frequency shift due to ultracold collisions

Kurt Gibble, Steven Chu

Research output: Contribution to journalArticle

211 Scopus citations

Abstract

We demonstate a laser-cooled Cs fountain which can be used as a frequency standard. The fountain has been used to measure the frequency shift due to ultracold Cs-Cs collisions at temperatures below 2.8 μK. The measured shift is -12.9±0.7 mHz for a density of (2.7±1.5)×109 cm-3 beginning with an even distribution (±10%) among the F=3, mF states. For a fountain with 95% of the atoms in the mF=0 states, we measure a frequency shift of -5.5±0.5 mHz at a density of (3.5±2.0)×108 cm-3.

Original languageEnglish (US)
Pages (from-to)1771-1774
Number of pages4
JournalPhysical Review Letters
Volume70
Issue number12
DOIs
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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