Accurate spectroscopy of Sr atoms

Abstract

We report the frequency measurement with an accuracy in the 100 kHz range of several optical transitions of atomic Sr : 1 S0 − 3 P1 at 689 nm, 3 P1 − 3 S1 at 688 nm and 3 P0 − 3 S1 at 679 nm. Measurements are performed with a frequency chain based on a femtosecond laser referenced to primary frequency standards. They allowed the indirect determination with a 70 kHz uncertainty of the frequency of the doubly forbidden 5s 2 1 S0 − 5s5p 3 P0 transition of 87 Sr at 698 nm and in a second step its direct observation. Frequency measurements are performed for 88 Sr and 87 Sr, allowing the determination of 3 P0, 3 P1 and 3 S1 isotope shifts, as well as the 3 S1 hyperfine constants.

Reservoir spectroscopy of5s5p3P2–5snStellmer1, Schreck2 2014Phys. Rev. A317441View full textAdd to dashboardCite

“…To characterize the calibration fidelity of the wavemeter over a large range of wavelengths, we measure the frequency of various lasers referenced to various wellestablished optical transitions, of which the absolute frequencies are well known from the literature. More specifically, these are the 4s 2 S 1/2 -4p 2 P 1/2 dipole transition at 397 nm in the 40 Ca + ion, which is known to within 1.7 MHz [98]; the 5s 2 1 S 0 -5s5p 3 P 1 intercombination line at 689 nm in atomic 88 Sr, which is known to within 10 kHz [61,99]; and the 5s 2 S 1/2 -5p 2 P 3/2 dipole transition at 780 nm in atomic 87 Rb, which is known to within 6 kHz [100]. The infrared light at 793 nm, which is used to generate the light at 397 nm, is used as well.…”

“…[60] for a recent compilation. The 5s5p as the isotope shifts and hyperfine splittings involved, have been measured to a precision of a few 100 kHz [61]. The Rydberg series 5snd 3 D 1,2,3 for n > 12 has been investigated in a discharge [62], and the series 5snd 3 D 2 for n > 4 has been studied by multiphoton ionization [63].…”

Bose-Einstein condensation ofSr88through sympathetic cooling withSr87Mickelson1, Escobar2, Yan3 et al. 2010Phys. Rev. A493680View full textAdd to dashboardCite

“…The isotope shift (f 87 − f 88 = 110 MHz) [25] is small compared to the ∼500 MHz width of the repumping efficiency curve [31] for 88 Sr and the ∼3 GHz width of the hyperfine structure in 87 Sr [25]. We tune the 3 µm laser 1.6 GHz blue-detuned from the 88 Sr resonance, [22][23][24]. Total quantum number F is indicated for 87 Sr levels.…”

From optical lattice clocks to the measurement of forces in the Casimir regime

“…85,87 Rb or 171,173 Yb). The difference in U QED between two isotopes is determined by the difference in polarizability, which is expected to be of the same order as the isotope shift of the main atomic transitions (typically around 10 −6 in relative value [57]), so a differential measurement should allow the cancelation of U QED at about that level, consistent with the required uncertainty for a measurement in the third well or further. The disadvantage of such a measurement is that only the differential effect of U Y uk is observed which is a factor ∆m at /m at ≈ 0.01 (with ∆m at the isotopic mass difference) smaller than the full effect.…”