Holographic Power-law Traps for the Efficient Production of Bose-Einstein Condensates

Graham D. Bruce, Sarah L. Bromley, Giuseppe Smirne, Lara Torralbo-Campo, and Donatella Cassettari

Phys. Rev. A 84, 053410 (2011) https://doi.org/10.1103/PhysRevA.84.053410

Abstract

We use a phase-only spatial light modulator to generate light distributions in which the intensity decays as a power law from a central maximum, with order ranging from 2 (parabolic) to 0.5. We suggest that a sequence of these can be used as a time-dependent optical dipole trap for all optical production of Bose-Einstein condensates in two stages: efficient evaporative cooling in a trap with adjustable strength and depth, followed by an adiabatic transformation of the trap order to cross the BEC transition in a reversible way. Realistic experimental parameters are used to verify the capability of this approach in producing larger Bose-Einstein condensates than by evaporative cooling alone.

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