Suspension of atoms using optical pulses, and application to gravimetry

Phys Rev Lett. 2009 Apr 17;102(15):150403. doi: 10.1103/PhysRevLett.102.150403. Epub 2009 Apr 16.

Abstract

Atoms from a (87)Rb condensate are suspended against gravity using repeated reflections from a pulsed optical standing wave. Up to 100 reflections are observed, yielding suspension times of over 100 ms. The local gravitational acceleration can be determined from the pulse rate required to achieve suspension. Further, a gravitationally sensitive atom interferometer was implemented using the suspended atoms. This technique could potentially provide a precision measurement of gravity without requiring the atoms to fall a large distance.