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Quantum Electronics and Laser Science Conference

Side-pumped Hollow-core Fiber for Atom Guiding

Fredrik K. Fatemi, Mark Bashkansky, H. C. Busch, S.W. Moore, Mark Bashkansky, H. C. Busch, S.W. Moore

Published Dec 10, 2005• 0 citations
Publisher

Abstract

We demonstrate a side-pumping technique for high efficiency (>80%) light coupling into double-clad hollow-core optical fibers for evanescent wave atom-guiding. We examine the benefits of the scheme and techniques for optimizing atom throughput
DOI
10.1109/qels.2005.1549149

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Laser-cooled atoms from a low-velocity atomic source are guided in a hollow-core optical fiber using the evanescent-wave dipole force from blue-detuned laser light launched into the glass region of the fiber. The transverse velocity of the guided atoms corresponds to a temperature of $50 \ensuremath{\mu}\mathrm{K}.$ We achieve a maximum flux through a 23.5-cm-long fiber of 590 000 atoms/second with a laser power of 55 mWatts at a detuning of 6 GHz. With larger detunings of 40 GHz, spontaneous emission from the atoms inside the fiber can be suppressed and the atom's internal-state population is preserved. We identify two major loss mechanisms for the guiding process and discuss possible solutions.