153 citations · 333 across the 4 of their papers we have counts for
4 papers
Measurement of fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations
Karim Benmessai, Daniel Lloyd Creedon, Michael Edmund Tobar +3
We report observations of the Schawlow-Townes noise limit in a cryogenic sapphire secondary frequency standard. The effect causes a fundamental limit to the frequency stability, an…
Relativity tests by complementary rotating Michelson-Morley experiments
Holger Mueller, Paul Louis Stanwix, Michael Edmund Tobar +6
We report Relativity tests based on data from two simultaneous Michelson-Morley experiments, spanning a period of more than one year. Both were actively rotated on turntables. One…
Test of Lorentz Invariance in Electrodynamics Using Rotating Cryogenic Sapphire Microwave Oscillators
Paul L. Stanwix, Michael E. Tobar, Peter Wolf +5
We present the first results from a rotating Michelson-Morley experiment that uses two orthogonally orientated cryogenic sapphire resonator-oscillators operating in whispering gall…
Tests of Lorentz Invariance Using a Microwave Resonator: An Update
P. Wolf, S. Bize, A. Clairon +3
The frequencies of a cryogenic sapphire oscillator and a hydrogen maser are compared to set new constraints on a possible violation of Lorentz invariance. We determine the variatio…