Abstract
Three 0.2 micron period diffraction gratings were combined to realize an atom interferometer1 in which the interfering beams are distinctly separated in both position and momentum. A 10 cm long foil 10 microns thick was positioned symmetrically between two side electrodes, so that the atom wave in the two sides of the interferometer went on opposite sides of it. The fringe amplitude was 820 cps, which allows us to determine the phase to 15 milliradians in 1 minute.2
© 1993 Optical Society of America
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