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The use of a hollow light beam reduces the loss of atoms inside and outside an evanescent-light funnel. Therefore, we superimpose an LG 01 beam with a small hole onto a doughnut beam with a large outer diameter and couple the resultant hollow light beam to the 240-μm-wide outlet of an inverted trigonal-pyramidal funnel. Compared to the case where a Gaussian light beam is employed for generation...
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