Inter-combination line frequencies in Yb validated with the clock transition: erratum.

This erratum corrects an error in Appl. Opt.62, 3932 (2023)APOPAI0003-693510.

Intercombination line frequencies in Yb validated with the clock transition.

We have carried absolute frequency measurements of the (6 ) -(66) transition in (intercombination line), where the spin-1/2 isotope yields two hyperfine lines. The measurements rely on sub-Doppler spectroscopy to yield a discriminator to which a 556 nm laser is locked. The frequency reference for the optical frequency measurements is a high-quality quartz oscillator steered to the GNSS time scale that is bridged with a frequency comb.

Test of Lorentz invariance in electrodynamics using rotating cryogenic sapphire microwave oscillators.

We present the first results from a rotating Michelson-Morley experiment that uses two orthogonally orientated cryogenic sapphire resonator oscillators operating in whispering gallery modes near 10 GHz. The experiment is used to test for violations of Lorentz invariance in the framework of the photon sector of the standard model extension (SME), as well as the isotropy term of the Robertson-Mansouri-Sexl (RMS) framework. In the SME we set a new bound on the previously unmeasured kappa(ZZ)(e-) component of 2.