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Diffusion experiments of a metter wave on a finite size optical lattice

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Wave diffraction on periodic media is ubiquitous in optics. In particular, fiber Bragg gratings, i.e gratings imprinted directly in a fiber core are essential components widely used for example in telecommunication devices and integrated fiber laser. In close analogy with these optical devices, we study the scattering of a guided matter wavepacket on a finite size lattice. Furthermore, in atom optics, it is easily possible to vary in time the depth of the periodic potential which opens new possibilities. By switching on adiabatically the optical lattice on a moving wavepacket, we realize a Bragg cavity for matter waves. Alternatively, the scattering on a modulated lattice enables one to engineer finely the momentum distribution using only external degrees of freedom.

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