Evgeny V. Kovalchuk

Rotating optical cavity experiment testing Lorentz invariance at the 10-17 level

We present an improved laboratory test of Lorentz invariance in electrodynamics by testing the isotropy of the speed of light. Our measurement compares the resonance frequencies of two orthogonal optical resonators that are implemented in a single block of fused silica and are rotated continuously on a precision air bearing turntable. An analysis of data recorded over the course of one year sets a limit on an anisotropy of the speed of light of

Tests of relativity by complementary rotating Michelson-Morley experiments.

\ensuremath{\Delta}c/c\ensuremath{\sim}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}

Test of the isotropy of the speed of light using a continuously rotating optical resonator.

. This constitutes the most accurate laboratory test of the isotropy of

High-resolution Doppler-free molecular spectroscopy with a continuous-wave optical parametric oscillator.

c

Combination of a continuous-wave optical parametric oscillator and a femtosecond frequency comb for optical frequency metrology

to date and allows to constrain parameters of a Lorentz violating extension of the standard model of particle physics down to a level of

Direct terrestrial test of Lorentz symmetry in electrodynamics to 10-18

{10}^{\ensuremath{-}17}

Offset compensation by use of amplitude-modulated sidebands in optical frequency standards

.

High performance iodine frequency reference for tests of the LISA laser system

We report relativity tests based on data from two simultaneous Michelson-Morley experiments, spanning a period of more than 1 yr. Both were actively rotated on turntables. One (in Berlin, Germany) uses optical Fabry-Perot resonators made of fused silica; the other (in Perth, Australia) uses microwave whispering-gallery sapphire resonators. Within the standard model extension, we obtain simultaneous limits on Lorentz violation for electrons (5 coefficients) and photons (8) at levels down to 10(-16), improved by factors between 3 and 50 compared to previous work.

Testing Lorentz Invariance by Comparing Light Propagation in Vacuum and Matter

We report on a test of Lorentz invariance performed by comparing the resonance frequencies of one stationary optical resonator and one continuously rotating on a precision air bearing turntable. Special attention is paid to the control of rotation induced systematic effects. Within the photon sector of the standard model extension, we obtain improved limits on combinations of 8 parameters at a level of a few parts in 10(-16). For the previously least well known parameter we find [EQUATION: SEE TEXT]. Within the Robertson-Mansouri-Sexl test theory, our measurement restricts the isotropy violation parameter [EQUATION: SEE TEXT]. corresponding to an eightfold improvement with respect to previous nonrotating measurements.

Iodine based optical frequency reference with 10 −15 stability

We present a reliable, narrow-linewidth (100-kHz) continous-wave optical parametric oscillator (OPO) suitable for high-resolution spectroscopy applications. The singly resonant OPO with a resonated pump is based on periodically poled lithium niobate crystal and features a specially designed intracavity etalon, which permits precise tuning to any desired wavelength in a wide range. We demonstrate Doppler-free spectroscopy of a rovibrational transition of methane at 3.39 mum.