Laboratory Test of the Isotropy of Light Propagation at the10−17Level

Ch. Eisele, A. Yu. Nevsky, S. Schiller
2009 Physical Review Letters  
We report on the results of a strongly improved test of local Lorentz invariance, consisting of a search for an anisotropy of the resonance frequencies of electromagnetic cavities. The apparatus comprises two orthogonal standing-wave optical cavities interrogated by a laser, which were rotated approximately 175 000 times over the duration of 13 months. The measurements are interpreted as a search for an anisotropy of the speed of light, within the Robertson-Mansouri-Sexl (RMS) and the standard
more » ... odel extension (SME) photon sector test theories. We find no evidence for an isotropy violation at a 1 uncertainty level of 0.6 parts in 10 17 (RMS) and 2 parts in 10 17 for seven of eight coefficients of the SME.
doi:10.1103/physrevlett.103.090401 pmid:19792767 fatcat:ac2ygo6yanbrdjk4lzgjc36hr4