Sub-Doppler cooling of bosonic strontium in a two-color MOT
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arXiv
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| Format: | Preprint |
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2025
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| author | Negyedi, Milán János Deutschle, Shubha Jessen, Florian Fortágh, József Sárkány, Lőrinc |
| author_facet | Negyedi, Milán János Deutschle, Shubha Jessen, Florian Fortágh, József Sárkány, Lőrinc |
| contents | We report a two-color magneto-optical trap that continuously operates on the $\mathrm{(5s^2)\:^1S_0-(5s5p)\:^1P_1}$ and $\mathrm{(5s5p)\:^3P_2-(5s5d)\:^3D_3}$ transitions in $\mathrm{^{88}Sr}$. Owing to the sub-Doppler cooling from the metastable $\mathrm{(5s5p)\:^3P_2}$ state, a bimodal momentum distribution is observed, with the cold part of the ensemble reaching a temperature of 105 $\mathrmμ$K. A detailed simulation is established to explain the data. The absolute frequency of the $\mathrm{(5s5p)\:^3P_2-(5s5d)\:^3D_3}$ transition is measured to be 603 976 473 ${\pm}$ 2 MHz using a frequency comb, improving the literature value. The accompanying magnetic trap is characterized, and is shown to contribute to the sequential production of ensembles with temperatures down to 45 $\mathrmμ$K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02693 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sub-Doppler cooling of bosonic strontium in a two-color MOT Negyedi, Milán János Deutschle, Shubha Jessen, Florian Fortágh, József Sárkány, Lőrinc Atomic Physics We report a two-color magneto-optical trap that continuously operates on the $\mathrm{(5s^2)\:^1S_0-(5s5p)\:^1P_1}$ and $\mathrm{(5s5p)\:^3P_2-(5s5d)\:^3D_3}$ transitions in $\mathrm{^{88}Sr}$. Owing to the sub-Doppler cooling from the metastable $\mathrm{(5s5p)\:^3P_2}$ state, a bimodal momentum distribution is observed, with the cold part of the ensemble reaching a temperature of 105 $\mathrmμ$K. A detailed simulation is established to explain the data. The absolute frequency of the $\mathrm{(5s5p)\:^3P_2-(5s5d)\:^3D_3}$ transition is measured to be 603 976 473 ${\pm}$ 2 MHz using a frequency comb, improving the literature value. The accompanying magnetic trap is characterized, and is shown to contribute to the sequential production of ensembles with temperatures down to 45 $\mathrmμ$K. |
| title | Sub-Doppler cooling of bosonic strontium in a two-color MOT |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2507.02693 |