Abstract
Recently, two gravitational laser trapping schemes for neutral atoms by evanescent-waves and a dark hollow beam are proposed by Soding et al.1 and us,2 respectively. Subsequently, Kuga et al.3 demonstrated a novel optical trap for Rb atoms by using a doughnut beam and obtained a cold atom sample with a temperature of about 18 μK and an atomic number of 108 atoms. However, there is no cooling mechanism in this doughnut-beam trap (DBT).
© 1998 Optical Society of America
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