Phys. Rev. Lett. 93, 240404 (2004) [4 pages]Atomic Interferometer with Amplitude Gratings of Light and Its Applications to Atom Based Tests of the Equivalence PrincipleReceived 18 February 2004; published 8 December 2004 We have developed a matter wave interferometer based on the diffraction of atoms from effective absorption gratings of light. In a setup with cold rubidium atoms in an atomic fountain the interferometer has been used to carry out tests of the equivalence principle on an atomic basis. The gravitational acceleration of the two isotopes 85Rb and 87Rb was compared, yielding a difference Δg/g=(1.2±1.7)×10-7. We also perform a differential free fall measurement of atoms in two different hyperfine states, and obtained a result of Δg/g=(0.4±1.2)×10-7. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.240404
DOI:
10.1103/PhysRevLett.93.240404
PACS:
03.75.Dg, 04.80.Cc, 39.20.+q, 42.50.Vk
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