Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap

Abstract:We report the results of two-photon-excited fluorescence (TPEF) measurements of the $5\mathrm{S}_{1/2} \rightarrow 5\mathrm{D}_{5/2}$ transition of $^{85}$Rb and $^{87}$Rb cooled in a magneto-optical trap (MOT). We observe TPEF at excitation powers as low as 1 $\mu$W or fluxes as low as $2.98_{-0.94}^{+1.37} \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{85}$Rb) and $3.31_{-1.33}^{+2.21} \times 10^{18}\ \text{photons}\,\text{cm}^{-2}\,\text{s}^{-1}$ ($^{87}$Rb). Our results demonstrate that optically cooled Rb is a promising platform for observing sensitive two-photon spectral signatures at low photon fluxes.

Atomic Physics (physics.atom-ph); Applied Physics (physics.app-ph); Quantum Physics (quant-ph)

arXiv:2602.07161 [physics.atom-ph]

(or arXiv:2602.07161v2 [physics.atom-ph] for this version)

https://doi.org/10.48550/arXiv.2602.07161 Focus to learn more arXiv-issued DOI via DataCite

https://doi.org/10.1103/c8gq-zp19 Focus to learn more DOI(s) linking to related resources

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