Atomic interferometer with amplitude gratings of light and its applications to atom based tests of the equivalence principle.
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).
Fray
Sebastian
S
Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Diez
Cristina Alvarez
CA
Hänsch
Theodor W
TW
Weitz
Martin
M