Phys. Rev. Lett. 66, 2693–2696 (1991)An interferometer for atomsReceived 7 March 1991; published in the issue dated 27 May 1991 We have demonstrated an interferometer for atoms. A three-grating geometry is used, in which the interfering beams are distinctly separated in both position and momentum. We used a highly collimated beam of sodium atoms with a de Broglie wavelength of 16 pm and high-quality 0.4-μm-period free-standing gratings which we fabricated using a novel method. The interference signal is 70 counts/s, which allows us to determine the phase to 0.1 rad in 1 min. Applications of atom interferometers are briefly discussed. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.66.2693
DOI:
10.1103/PhysRevLett.66.2693
PACS:
07.60.Ly, 35.10.-d, 42.10.Jd
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