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We present the experimental implementation of double Bragg diffraction ofBose-Einstein condensates (BECs) as proposed in [E. Giese, A. Roura, G.Tackmann, E. M. Rasel, and W. P. Schleich, Phys. Rev. A \textbf{88}, 053608(2013)]. We excite Rabi oscillations between the three coupled momentum states$\left| 0 \hbar k \right\rangle$ and $\left| \pm 2 \hbar k \right\rangle$. Byselecting appropriate interaction times we generate highly efficientbeamsplitters and mirrors for Bose-Einstein condensates. In addition, wedemonstrate higher-order double Bragg diffraction and display beamsplitterswith up to $ \pm 6 \hbar k$ momentum transfer. We compare double Braggdiffraction to several other experimental realizations of beamsplitters.Finally, we show that double Bragg diffraction is well suited for matter waveinterferometry by realizing a Ramsey-type interferometer in a quasione-dimensional waveguide.

Experimental realization of double Bragg diffraction: robust beamsplitters, mirrors, and interferometers for Bose-Einstein condensates