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

Abstract

We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium 5$D_{3/2}$ level, ${\alpha }_{5D_{3/2}}^S$, at a wavelength of $\lambda =1064$~nm. Since $\lambda$ is shorter than the photoionization (PI) limit of the Rb 5$D_{3/2}$ level, ${\alpha }_{5D_{3/2}}^S$ 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 ($\sim 10^5$~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, ${\alpha }_{5D_{3/2}}^S=-524(17)$, 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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Cited by in corpus (4)

• Electric field analysis in a cold-ion source using Stark spectroscopy of Rydberg atoms
• An optical atomic clock using $4D_J$ states of rubidium
• Spectroscopy of the ${}^{85}$Rb 4$D_{3/2}$ state for hyperfine-structure determination
• Dynamic polarizability of the ${}^{85}$Rb $5D_{3/2}$-state in 1064 nm light