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Conference on Lasers and Electro-Optics

Optimizing the Dipole Trap for Loading Laser-Cooled Atoms into Hollow-Core Fibers

Taehyun Yoon, Paul Anderson, Sheng-Xiang Lin, Bryan Duong, Michal Bajcsy

Published May 5, 2019• 0 citations
Publisher

Abstract

We study the effects of dipole trap wavelength and power on the number of laser-cooled atoms loaded into a hollow-core optical fiber to optimize the trade-oft's between the observed loss mechanisms.
DOI
10.23919/cleo.2019.8750467

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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.
We have used optical forces to guide atoms through hollow-core optical fibers. Laser light is launched into the hollow region of a glass capillary fiber and guided by grazing-incidence reflection from the walls. When the laser is detuned 1--30 GHz red of the Rb D2 resonance lines, dipole forces attract atoms to the high-intensity region along the axis and guide them through the fiber. We show that atoms may be guided around bends in the fiber and that in initial experiments the atoms experience up to 18 reflections from the potential walls with minimal loss.