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

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

URL: http://arxiv.org/abs/2602.07161v1
Date: Fri, 06 Feb 2026 20:03:03 GMT
Title: Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap
Authors: Alan McLean, Christian Drago, Daniel Podos, Chengyi Luo, Caleb Brzezinski, Ting-Wei Hsu, John Sipe, Ralph Jimenez,
Abstract summary: Two-photon-excited fluorescence (TPEF) measurements of the $5mathrmS_1/2 rightarrow 5mathrmD_1/2$ transition of $85$Rb and $87$Rb cooled in a magneto-optical trap (MOT)<n>We observe TPEF at excitation powers as low as 1 $$W or as low as $4.30 pm 0.22 times 1018 textphotons,textcm-2,texts-1
Score: 0.028106259549258137
License: http://creativecommons.org/licenses/by/4.0/
Abstract: 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.

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