Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2026
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| author | McLean, Alan Drago, Christian Podos, Daniel Luo, Chengyi Brzezinski, Caleb Hsu, Ting-Wei Sipe, John Jimenez, Ralph |
| author_facet | McLean, Alan Drago, Christian Podos, Daniel Luo, Chengyi Brzezinski, Caleb Hsu, Ting-Wei Sipe, John Jimenez, Ralph |
| contents | We report the results of two-photon-excited fluorescence (TPEF) measurements of the $5\mathrm{S}_{1/2} \rightarrow 5\mathrm{D}_{1/2}$ transition of $^{85}$Rb and $^{87}$Rb cooled in a magneto-optical trap (MOT). We observe TPEF at excitation powers as low as 1 $μ$W or fluxes as low as $4.30 \pm 0.22 \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{85}$Rb) and $5.17 \pm 0.26 \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{87}$Rb). Our results show that Rb, with additional benefits due to its ability to be optically cooled to the point where Doppler-broadening is negligible, is a promising platform for observing sensitive two-photon spectral signatures at low photon fluxes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_07161 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap McLean, Alan Drago, Christian Podos, Daniel Luo, Chengyi Brzezinski, Caleb Hsu, Ting-Wei Sipe, John Jimenez, Ralph Atomic Physics Applied Physics Quantum Physics We report the results of two-photon-excited fluorescence (TPEF) measurements of the $5\mathrm{S}_{1/2} \rightarrow 5\mathrm{D}_{1/2}$ transition of $^{85}$Rb and $^{87}$Rb cooled in a magneto-optical trap (MOT). We observe TPEF at excitation powers as low as 1 $μ$W or fluxes as low as $4.30 \pm 0.22 \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{85}$Rb) and $5.17 \pm 0.26 \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{87}$Rb). Our results show that Rb, with additional benefits due to its ability to be optically cooled to the point where Doppler-broadening is negligible, is a promising platform for observing sensitive two-photon spectral signatures at low photon fluxes. |
| title | Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap |
| topic | Atomic Physics Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2602.07161 |