Absolute frequency measurements in Yb with0.08ppbuncertainty: Isotope shifts and hyperfine structure in the399−nm

Dipankar Das

¹

,

Sachin Barthwal

²

,

Ayan Banerjee

³

et al.

Measurement of the Yb IS01−P11transition frequency at 399 nm using an optical frequency comb

“…Our frequency comb measurements disagree with the value reported in Ref. [12], as discussed in the following section.…”

“…[12] produces unreliable results [22]. The K-39 D1 and D2 hyperfine-free transitions published by this group disagree strongly with frequency comb measurements by 478 MHz and 592 MHz, respectively [22], even though the uncertainties were estimated to be 0.05 and 0.1 MHz.…”

“…[12] differs from previous work in that a bow-tie cavity was used instead of a linear one. This method has produced good measurement results when the transition frequency was previously known with high enough accuracy.…”

“…[12]. This measurement was based on a wavelength comparison between two lasers using an optical cavity.…”

“…[12], only the NIST Atomic Spectra Database data was available for the absolute frequency of the Yb I 399 nm transition [28]. The uncertainties related to these data are perhaps ±150 MHz, although the uncertainties are not well characterized [29].…”