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Journal of the Optical Society of America

Two-photon absorption to highly excited D states of Rb atoms*

Y. Kato, Boris Peter Stoicheff

Published May 1, 1976• 48 citations
Publisher

Abstract

Highly excited D states (n = 11 to 32) of Rb atoms were studied by Doppler-free two-photon absorption spectroscopy using a cw dye laser. These D doublets are not inverted, and their spacings do not vary as neff-3, nor as n−3; the 85Rb, 87Rb isotope shift in the ground state is found to be 160 ± 12 MHz.
DOI
10.1364/josa.66.000490

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Two-photon absorption spectroscopy of highly-excited states of Rb atoms

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Conference on Lasers and Electro-Optics•Jan 1, 1982•0 citations
Doppler-free two-photon absorption spectroscopy was applied to study highly-excited D states of Rb atoms. Using a cw dye laser as an excitation source, transitions from the ground 5S state to nd 2D states (n=11-32) were observed, the ionization energy of the highest state being only 117cm-1. These D doublets are not inverted. The fine structure splittings of these states do not vary as (neff) -3, nor as n-3. The isotope shift of the 85Rb, 87Rb ground states is found to be 160±12MHz. No pressure broadening was observed for these transitions within the instrumental resolution of 15 MHz.
Doppler-free two-photon absorption experiments have been preliminarily carried out to investigate the highly excited D states of Rb atom using a cw tunable dye laser.The two-photon absorption signals with big signal to noise ratios have been obtained by means of a space-charge limited ionization detector equipped inside a Rb cell.The sharp slope of the first derivative curve of the absorption signal shows the entire possibility of frequency stabilization of a dye laser in terms of ultra-violet wavelength references via two-photon absorption technique.The obtained experimental results are compared with the results which have been performed so far by other researchers, and quantitative discussions are made.
Frequency-modulation spectroscopy was employed successfully to measure the Doppler-free absorption and dispersion signals originating from several two-photon transitions in (85)Rb and (87)Rb. The two-photon cross section of the hyperfine transition 5S(1/2) (F = 2) ? 5D(5/2) (F = 4) in (87)Rb was determined to be sigma((2)) asymptotically equal to 4 x 10(-20) cm(4)/W. The transition isotope shift (TIS) of the transition 5S(1/2) ? 5D(5/2) between (87)Rb and (85)Rb was found to be Deltanu(TIS) = +166 +/- 2 MHz.
Abstract Using a Rb cell and a wavemeter, with a Doppler-free two-photon transition near 993 nm, we have measured the four hyperfine components (two isotopes, Δ F = 0) of the 5S–6S transition, finding the absolute energies of those transitions to a spectral resolution of 0.002 cm −1 = 60 MHz. We find the (87 minus 85) isotope shift of the 5S–6S transition to be +94(12) MHz. Using our single frequency cw laser with focused intensity up to 10 4 W cm −2 at the cell, we find no AC Stark or light shift of the lines at 6 MHz spectral resolution. We find no density shift of the lines at 6 MHz spectral resolution, for a range of Rb atom densities from 3 × 10 11 to 5 × 10 13 atoms/cm 3 .
Two-photon, Doppler-free spectroscopy with counter-propagating beams from a cw dye laser and a new type of thermionic detector have been used to study the 2D32^{2}D_{\frac{3}{2}}2D23​​ and 2D52^{2}D_{\frac{5}{2}}2D25​​ levels of Rb for Rydberg states up to n=85n=85n=85, only 16 ${\mathrm{cm}}^{\ensuremath{-}1}$ from the ionization limit. It is shown that the fine-structure spacing varies as ${{n}_{\mathrm{eff}}}^{\ensuremath{-}3}$ for $n>\ensuremath{\sim}25$, and as a linear combination of ${{n}_{\mathrm{eff}}}^{\ensuremath{-}5}$ and ${{n}_{\mathrm{eff}}}^{\ensuremath{-}3}$ for $n<\ensuremath{\sim}25$.