Limitation of single-repumping schemes for laser cooling of Sr atoms

Abstract

We explore the efficacy of two single-repumping schemes, $5s5p{}^3{P}_2-5p^2{}^3{P}_2$ ($481\mathrm{nm}$) and $5s5p{}^3{P}_2-5s5d{}^3{D}_2$ ($497\mathrm{nm}$), for a magneto-optical trap (MOT) of Sr atoms. We reveal that the enhancement in the MOT lifetime is limited to $26.9(2)$ for any single-repumping scheme. Our investigation indicates that the primary decay path from the $5s5p{}^1{P}_1$ state to the $5s5p{}^3{P}_0$ state proceeds via the $5s4d{}^3{D}_1$ state, rather than through the upper states accessed by the single-repumping lasers. We estimate that the branching ratio for the $5s5p{}^1{P}_1\to 5s4d{}^3{D}_1\to 5s5p{}^3{P}_0$ decay path is $1:3.9\times 10^6$ and the decay rate for the transition from the $5s5p{}^1{P}_1$ state to the $5s4d{}^3{D}_1$ state is $83(32){\mathrm{s}}^{-1}$. This outcome underscores the limitation on atom number in the MOT for long loading times ($\gtrsim 1\mathrm{s}$) when employing a single-repumping scheme. These findings will contribute to the construction of field-deployable optical lattice clocks.

8 pages, 4 figures, 1 table

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Cited by in corpus (3)

• Analyzing the optical pumping on the $5s4d{}^1{D}_2-5s8p{}^1{P}_1$ transition in a magneto-optical trap of Sr atoms
• Direct loading of a Sr magneto-optical trap from a thermal atomic beam
• Direct Measurement of the $5s5p{}^1{P}_1\to 5s4d{}^1{D}_2$ Decay Rate in Strontium