Prof. Zavattini Guido (University of Ferrara and INFN-Ferrara)
A new highly sensitive ellipsometer is now running at the Department of Physics and INFN of Ferrara, Italy. The apparatus has been designed to detect very small magnetically induced birefringences with the ultimate goal of measuring vacuum magnetic birefringence. This challenging goal is not yet achievable due to excess noise which is under study. Nonetheless new limits on vacuum magnetic birefringence have been recently set and measurements are still underway. Taking advantage of the cavity intrinsic birefringence, our ellipticity limit can also be used to set a dichroism limit. From these two values we set model independent limits on the coupling constant of axion like particles to two photons.
Mr Aldo Ejlli (University of Ferrara and INFN-Ferrara) Prof. Edoardo Milotti (University of Trieste and INFN-Trieste) Mr Federico Della Valle (University of Trieste and INFN-Trieste) Mr Giuseppe Ruoso (INFN-Laboratori Nazionali di Legnaro) Mr Ruggero Pengo (INFN-Laboratori Nazionali di Legnaro) Mr Ugo Gastaldi (INFN-Ferrara) Prof. Zavattini Guido (University of Ferrara and INFN-Ferrara)