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Optics Letters

Improved hyperfine measurements of the Na 5p excited state through frequency-controlled Dopplerless spectroscopy in a Zeeman magneto-optic laser trap

M. Zhu, Chris W. Oates, J. L. Hall

Published Jul 15, 1993• 22 citations
Publisher

Abstract

We report what is to our knowledge the first Dopplerless high-resolution optical spectroscopy based on unperturbed atoms left nearly at rest when a vapor cell magneto-optic trap is switched off. A λ = 285 nm beam excited the 3s → 5p transition in our sample of laser trapped/cooled Na atoms from which we collected fluorescence. Excited-state 52P3/2 and 52P1/2 hyperfine interaction constants are derived with 4- and 47-fold increases, respectively, in accuracy. Future prospects for vapor-cell-based optical spectroscopy and frequency standards are considered.

DOI
10.1364/ol.18.001186

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We report the first observation of a nondipole transition in an ultracold atomic vapor. We excite the $3P\mathrm{\text{\ensuremath{-}}}4P$ electric quadrupole (E2E2E2) transition in 23Na^{23}\mathrm{N}\mathrm{a}23Na confined in a magneto-optical trap, and we demonstrate its application to high-resolution spectroscopy by making the first measurement of the hyperfine structure of the 4P1/24{P}_{1/2}4P1/2​ level and extracting the magnetic dipole constant $\mathrm{A}=30.6\ifmmode\pm\else\textpm\fi{}0.1\text{ }\text{ }\mathrm{M}\mathrm{H}\mathrm{z}$. We use cw optical-optical double resonance accompanied by photoionization to probe the transition.