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We present the current status and outlook of the optical characterization ofthe polarimeter at the Bir\'{e}fringence Magn\'etique du Vide (BMV) experiment.BMV is a polarimetric search for the QED predicted anisotropy of vacuum in thepresence of external electromagnetic fields. The main challenge faced in thisfundamental test is the measurement of polarization ellipticity on the order of${10^{-15}}$ induced in linearly polarized laser field per pass through amagnetic field having an amplitude and length${B^{2}L=100\,\mathrm{T}^{2}\mathrm{m}}$. This challenge is addressed byunderstanding the noise sources in precision cavity-enhanced polarimetry. Inthis paper we discuss the first investigation of dynamical birefringence in thesignal-enhancing cavity as a result of cavity mirror motion.

Characterization of the Vacuum Birefringence Polarimeter at BMV: Dynamical Cavity Mirror Birefringence