A polarisation modulation scheme for measuring vacuum magnetic   birefringence with static fields
  A novel polarisation modulation scheme for polarimeters based on Fabry-Perot cavities is presented. The application to the proposed HERA-X experiment aiming to measuring the magnetic birefringence of vacuum with the HERA superconducting magnets is discussed. 
G. Zavattini, F. Della Valle, A. Ejlli, G. Ruoso
physics.optics