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We demonstrate a simple scheme to reach Bose-Einstein condensation (BEC) ofmetastable triplet helium atoms using a single beam optical dipole trap withmoderate power of less than 3 W. Our scheme is based on RF-induced evaporativecooling in a quadrupole magnetic trap and transfer to a single beam opticaldipole trap that is located below the magnetic trap center. We transfer 1x10^6atoms into the optical dipole trap, with an initial temperature of 14 \mu K,and observe efficient forced evaporative cooling both in a hybrid trap, inwhich the quadrupole magnetic trap operates just below the levitation gradient,and in the pure optical dipole trap, reaching the onset of BEC with 2x10^5atoms and a pure BEC of 5x10^4 atoms. Our work shows that a single beam hybridtrap can be applied for a light atom, for which evaporative cooling in thequadrupole magnetic trap is strongly limited by Majorana spin-flips, and thevery small levitation gradient limits the axial confinement in the hybrid trap.

Simple method for producing Bose-Einstein condensates of metastable helium using a single beam optical dipole trap