Abstract
We realize an experimental facility for cooling and trapping strontium (Sr) atoms and measure the Landé g factor of 3D1 of 88Sr. Thanks to a novel repumping scheme with the 3P2 → 3S1 and 3P0 → 3D1 combination and the permanent magnets based self-assembled Zeeman slower, the peak atom number in the continuously repumped blue magneto-optical trap is enhanced by a factor of 15 with respect to the non-repumping case, and reaches ∼1 billion. Furthermore, using the resolved-sideband Zeeman spectroscopy, the Landé g factor of 3D1 is measured to be 0.4995(88) showing a good agreement with the theoretical value of 0.4988. The results will have an impact on various applications including atom laser, dipolar interactions, quantum information and precision measurements.
Highlights
Two ion pumps of 25 Ls−1 each placed close to the atomic source prevent the pressure around the oven from rising when in operation
A self-assembled Zeeman slower placed after the oven provides a high-flux atomic beam with a significant portion of atoms within the capture velocity of the MOT of 70 ms−1
The science chamber is a custom made spherical octagon made of titanium which has a side length of mm and depth of mm
Summary
The growing importance of laser-cooled atomic strontium (Sr) is starting to emerge in diverse fields, where in particular large atom numbers and high density are required, such as precision metrology[1,2,3,4,5,6,7,8,9], continuous Bose-Einstein condensation (BEC)[10, 11], quantum simulation[12,13,14] and prospects towards long range dipolar interactions[15,16,17]. Various repumping schemes for Sr have been demonstrated including single-laser repumping schemes addressing transitions to higher-lying states, such as 1D2→5s6p1P1[19], 5s5p3P2→5snd3D2,5p23P2[8, 20,21,22,23,24], and the most common dual repumping scheme combining 3P0,2→3S1 at 679 nm and 707 nm, respectively[25, 26]. Similar atom numbers have been reported in the past[27] These measurements required relatively higher temperature of their oven. We measure the Landé g factor of the 3D1 state using the resolved-sideband Zeeman spectroscopy, and the result shows a good agreement with the theoretically calculated value. These results pave the way towards future applications using these. 11.1%, 33.3%, 55.6%, 59.4%, 38.7% and 1.9%, respectively
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