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We have experimentally demonstrated a high level of control of the modepopulations of guided atom lasers (GALs) by showing that the entropy perparticle of an optically GAL, and the one of the trapped Bose Einsteincondensate (BEC) from which it has been produced are the same. The BEC isprepared in a crossed beam optical dipole trap. We have achieved isentropicoutcoupling for both magnetic and optical schemes. We can prepare GAL in anearly pure monomode regime (85 % in the ground state). Furthermore, opticaloutcoupling enables the production of spinor guided atom lasers and opens thepossibility to tailor their polarization.

From multimode to monomode guided atom lasers: an entropic analysis