A method to create paired atom laser beams from a metastable helium atomlaser via four-wave mixing is demonstrated. Radio frequency outcoupling is usedto extract atoms from a Bose Einstein condensate near the center of thecondensate and initiate scattering between trapped and untrapped atoms. Theunequal strengths of the interactions for different internal states allows anenergy-momentum resonance which leads to the creation of pairs of atomsscattered from the zero-velocity condensate. The resulting scattered beams arewell separated from the main atom laser in the 2-dimensional transverse atomlaser profile. Numerical simulations of the system are in good agreement withthe observed atom laser spatial profiles, and indicate that the scattered beamsare generated by a four-wave mixing process, suggesting that the beams arecorrelated.
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