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Frontiers in Optics

Measurement of the dc Stark-shift on the 3s23p2 3P1 → 3s23p4s 3P0 transition in silicon

Alina Gearba, Grant Clarno, Blake Eastman, Luke Phillips, Delaney Finley, Annabelle Towles, Randy Knize, Jerry Sell

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Laser cooling and trapping of silicon could provide a novel avenue to manipulate individual silicon atoms. We perform dc Stark-shift spectroscopy on a silicon atomic beam at 252.4 nm to measure the differential scalar polarizability.
DOI
10.1364/fio.2025.jw4a.23

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The dc Stark shift of the lithium D1 line has been observed using two visible diode lasers and an atomic beam. A heterodyne signal obtained from the two lasers permits a well-calibrated, high-precision measurement to be made. The scalar shift is found to be 4.6216(21) kHz/(kV/cm)2{)}^{2})2. We believe this result to be the most precise Stark shift measurement reported thus far.
The Stark shift of the (6s) 2 1 S 0 to (6s6p) 3 P 1 transition in ytterbium was measured using a laser to excite an atomic beam first in a uniform electric field and subsequently in a field-free region. The laser frequency was scanned across the transition while fluorescence produced by the radiative decay of the excited state was detected. The frequency scan was calibrated using isotope and hyperfine splittings that have been measured previously. The Stark shift rate was found to be -15.419+or-0.048 kHz kV -2 cm -2 and the tensor polarizability of the (6s6p) 3 P 1 state was determined to be alpha 2 =5.81+or-0.13 kHz kV -2 cm -2 .
Recoil-free as well as Doppler-free spectroscopy was demonstrated on the 1S0-3P1 transition of Sr atoms confined in a one-dimensional optical lattice. By investigating the wavelength and polarization dependence of the ac Stark shift acting on the 1S0 and 3P1(m(J)=0) states, we determined the wavelength where the Stark shifts for both states coincide. This Stark-free optical lattice, allowing the purturbation-free spectroscopy of trapped atoms, may keep neutral-atom based optical standards competitive with single-ion standards.
We observed the phase shift of the atomic wave function induced from the dc Stark effect using an atom interferometer comprised of four copropagating traveling laser beams. We calculated the interference signal for the interferometer in the case of a thermal atomic beam. By comparing the observed interference fringes with the calculated ones, the difference between the polarizabilities of the 3P1^{3}P_{1}3P1​ state and the 1S0^{1}S_{0}1S0​ state of calcium was obtained to be $\ensuremath{\alpha}(^{3}P_{1})\ensuremath{-}\ensuremath{\alpha}(^{1}S_{0})=(13.4\ifmmode\pm\else\textpm\fi{}2.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}24}$ cm3{\mathrm{cm}}^{3}cm3. This value was consistent with that deduced from the Stark frequency shift.