Ramsey interferometry with an atom laser.

@article{Dring2009RamseyIW,
  title={Ramsey interferometry with an atom laser.},
  author={Dirk D{\"o}ring and John E. Debs and Nicholas P. Robins and Cristina Figl and Paul A Altin and John D. Close},
  journal={Optics express},
  year={2009},
  volume={17 23},
  pages={
          20661-8
        }
}
We present results on a free-space atom interferometer operating on the first order magnetically insensitive |F = 1,mF = 0) --> |F = 2,mF = 0) ground state transition of Bose-condensed (87)Rb atoms. A pulsed atom laser is output-coupled from a Bose-Einstein condensate and propagates through a sequence of two internal state beam splitters, realized via coherent Raman transitions between the two interfering states. We observe Ramsey fringes with a visibility close to 100% and determine the… 
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