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

作者:Rengelink R J; Notermans R P M J W; Vassen W
来源:Applied Physics B: Lasers and Optics , 2016, 122(5): 122.
DOI:10.1007/s00340-016-6395-y

摘要

High-precision spectroscopy on the 2(3)S -> 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 (similar to 0.2 mu k) and in a Bose-Einstein condensate, with a trap lifetime of several seconds, mainly limited by off-resonant scattering

  • 出版日期2016-5