Konwersatorium im. J.Pniewskiego i L.Infelda
sala 0.03, ul. Pasteura 5
2019-01-14 (16:30) 
dr Agata Cygan (Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń)
Ultra-accurate frequency-based spectroscopy in an optical cavity
A novel one-dimensional CMDS method (cavity mode-dispersion spectroscopy) based on the frequency measurement of the dispersive shift of the optical cavity modes will be presented. The method is based on measurement of only one physical quantity - the frequency that can currently be realized with a relative accuracy up to 10-18. As a result, this method is more accurate than all other spectroscopic techniques and has the ability to easily reference the measured spectrum to the atomic frequency standard. Among numerous potential applications the most important is contemporary atmospheric research where even small systematic errors of data used to interpret measurements may lead to contradictory conclusions. The new method may be also crucial for metrology, ultra-accurate measurements of molecular structure and isotopic abundances, study of exoplanet atmospheres and search for extraterrestrial life, as well as quantum electrodynamics tests and search for phenomena beyond the Standard Model.