Abstract

We propose a novel three-dimensional diffraction-limited far-off-resonance optical dipole trap (DFORT) for neutral atoms operating in the Lamb–Dicke regime. Such a microscopic DFORT is generated by the diffracted ${\mathrm{LP}}_{01}$ mode of a hollow-core optical fiber near the fiber facet. For ${}^{87}\mathrm{Rb}$ and ${}^{133}\mathrm{Cs}$ atoms, we estimate that with a 100-mW trap-laser power, a cigar-shaped far-off-resonance optical dipole trap provides potential depth $U_0\simeq 10 \mathrm{mK},$ radial (axial) trap frequency $f_r\simeq 100 \mathrm{kHz}$ $(f_z\simeq 10 \mathrm{kHz}),$ and trap volume $V_{\mathrm{trap}}\simeq {10}^4$ ${\mathrm{\lambda }}^3.$ The DFORT has the unique feature of a tightly focused trap with a large trap volume and convenient loading and cooling of the precooled atoms, which may be useful for optical Bose–Einstein condensation. A DFORT may be also operated as an elongated one-dimensional optical trap.

© 2003 Optical Society of America

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