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Updated: Aug 19, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Atomic interferometer with amplitude gratings of light and its applications to atom based tests of the equivalence
Sebastian Fray1, Cristina Alvarez Diez, Theodor W Hänsch
1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Abstract:
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 Deltag/g=(1.2+/-1.7)x10(-7). We also perform a differential free fall measurement of atoms in two different hyperfine states, and obtained a result of Deltag/g=(0.4+/-1.2)x10(-7).
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