A simple 2 W continuous-wave laser system for trapping ultracold metastable helium atoms at the 319.8 nm magic wavelength

Abstract

High precision spectroscopy on the $2{}^{3}S\to 2{}^{1}S$ transition is possible in ultracold optically trapped helium but the accuracy is limited by the ac-Stark shift induced by the optical dipole trap. To overcome this problem, we have built a trapping laser system at the predicted magic wavelength of 319.8 nm. Our system is based on frequency conversion using commercially available components and produces over 2 W of power at this wavelength. With this system, we show trapping of ultracold atoms, both thermal ($\sim 0.2\mu \mathrm{K}$) and in a Bose-Einstein condensate, with a trap lifetime of several seconds, mainly limited by off-resonant scattering.

10 pages, 12 figures

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• Precision spectroscopy of helium in a magic wavelength optical dipole trap
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• Development and characterization of a 2.2 W narrow-linewidth 318.6 nm ultraviolet laser
• Pauli blocking of stimulated emission in a degenerate Fermi gas