Direct Imaging of Periodic Sub-wavelength Patterns of Total Atomic Density

Interference fringes of total atomic density with period $λ/4$ and $λ/2$ for optical wavelength $λ$, have been produced in de Broglie atom interferometer and directly imaged by means of an ``optical mask'' technique. The imaging technique allowed us to observe sub-wavelength periodic patterns with a resolution of $λ/16$. The quantum dynamics near the interference times as a function of the recoil phase and pulse areas has been investigated.

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