Generation of high-purity, low-temperature samples of ${}^{39}$K for applications in metrology

Abstract

We present an all optical technique to prepare a sample of ${}^{39}$K in a magnetically-insensitive state with 95\% purity while maintaining a temperature of 6 $\mu$K. This versatile preparation scheme is particularly well suited to performing matter-wave interferometry with species exhibiting closely-separated hyperfine levels, such as the isotopes of lithium and potassium, and opens new possibilities for metrology with these atoms. We demonstrate the feasibility of such measurements by realizing an atomic gravimeter and a Ramsey-type spectrometer, both of which exhibit a state-of-the-art sensitivity for cold potassium.

6 pages + references, 4 figures, accepted for publication in PRA

References in corpus (17)

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• All-optical production of a degenerate mixture of 6Li and 40K and creation of heteronuclear molecules
• Simultaneous sub-Doppler laser cooling of fermionic ${}^6$Li and ${}^{40}$K on the D${}_1$ line: Theory and Experiment
• Efficient Production of Large 39K Bose-Einstein Condensates
• All optical cooling of ${}^{39}$K to Bose Einstein condensation
• Degenerate Raman sideband cooling of 39K
• Studies of general relativity with quantum sensors

Cited by in corpus (6)

• Survey of hyperfine structure measurements in alkali atoms
• Precision measurement of the ionization energy and quantum defects of 39K I
• Testing the Universality of Free Fall using correlated ${}^{39}$K -- ${}^{87}$Rb interferometers
• Rapid generation of all-optical ${}^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance
• Experimental study of magnetically insensitive transitions in ultracold Fermi gas of ${}^{40}$K
• Quantum Physics in Space