AC polarizability and photoionization cross-section measurements in an optical lattice

• URL: http://arxiv.org/abs/2107.02635v2
• Date: Tue, 20 Jul 2021 13:15:19 GMT
• Title: AC polarizability and photoionization cross-section measurements in an optical lattice
• Authors: Ryan Cardman, Xiaoxuan Han, Jamie L. MacLennan, Alisher Duspayev, Georg Raithel
• Abstract summary: We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium 5$D_3/2$ level. Our method yields, in atomic units, $alphaS_5D_3/2=-524(17)$, in agreement with estimates.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium 5$D_{3/2}$ level, $\alpha^{S}_{5D_{3/2}}$, at a wavelength of $\lambda=1064$~nm. Since $\lambda$ is shorter than the photoionization (PI) limit of the Rb 5$D_{3/2}$ level, $\alpha^{S}_{5D_{3/2}}$ depends on both bound-bound and bound-free transition matrix elements. The level also undergoes significant broadening due to PI. The $1064$-nm field is applied in the form of a deep optical lattice ($\sim10^{5}$~photon recoils) generated by an in-vacuum field-enhancement cavity. In our spectroscopic method, we use known dynamic polarizabilities to eliminate the need to measure the light intensity. Our method yields, in atomic units, $\alpha^{S}_{5D_{3/2}}=-524(17)$, in agreement with estimates. Additionally, we extract the $5D_{3/2}$ photoionization cross section $\sigma$ at $1064$~nm from spectral linewidths; we find $\sigma=44(1)$~Mb.

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