Improved Laser Test of the Isotropy of Space

Analysis of the Anomalous Brillet and Hall Experimental Result

“…1 Aspden considered the change in angle of the output signal due to "motion of the mirror relative to the light reference frame" to be responsible for the non-null signal variation observed. However, the output signal in the Brillet-Hall experiment was monitored only for frequency change, and for an observer and apparatus fixed in the same frame, this does not vary with frame orientation, even in a Galilean analysis.…”

“…In 1978, Brillet and Hall [1] used a Fabry-Perot [2] interferometer that rotated with respect to the lab to measure the isotropy of space (i.e., of the speed of light). As the apparatus turned, anisotropic speed of light would cause otherwise coherent light waves to change phase and partially interfere, thereby reducing the transmitted wave intensity.…”

Tests of Relativity by Complementary Rotating Michelson-Morley Experiments

“…L and n are properties of macroscopic matter and thus sensitive to Lorentz violation in the Maxwell and Dirac equations that govern its constituents. However, each of the simple MM-experiments performed so far (recently, [9,10,11,12,13,14,15,16,17]) does not by itself provide enough information to distinguish between the different influences and thus can only bound combinations of them. To remove these restrictions, experiments featuring dissimilar cavities that have a different depen- * Electronic address: holgerm@stanford.edu…”

Cosmic ray and neutrino tests of special relativity

“…A laser-interferometric Michelson-Morley experiment [2] found |1 − c| < 10 −9 . Atomic physicists obtained stronger constraints using techniques pioneered by Hughes and Drever [3].…”