Three 0.2-μm period diffraction gratings were used to realize an interferometer for atoms and molecules1 that passes the interfering components of the deBroglie wave on opposite sides of a stretched metal foil positioned between two side plates. The foil was 10 cm long and 10 μ.m. thick, and a gas sample of density −2 × 1012 atoms/ cm3 could be introduced on one side of the foil only.

© 1994 Optical Society of America

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