Photon-photon scattering in vacuum is extremely weak. However, strong effective
interactions between single photons can be realized by employing strong light-matter …

This paper describes the 25 year effort to measure vacuum magnetic birefringence and
dichroism with the PVLAS experiment. The experiment went through two main phases: the …

The nature of dark matter (DM) and dark energy (DE) which is supposed to constitute about
95% of the energy density of the universe is still a mystery. There is no shortage of ideas …

Substrate-transferred crystalline coatings have recently emerged as a groundbreaking new
concept in optical interference coatings. Building upon our initial demonstration of this …

When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit
properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various …

We demonstrate that charged particles in a sufficiently intense standing wave are
compressed toward, and oscillate synchronously at, the antinodes of the electric field. We …

We present the current status of the BMV experiment. Our apparatus is based on an up-to-
date resonant optical cavity coupled to a transverse magnetic field. We detail our data …

In this report we show that a vacuum is a nonlinear optical medium and discuss what the
optical phenomena are that should exist in the framework of the standard model of particle …

We study the feasibility of measuring vacuum birefringence by probing the focus of a high-
intensity optical laser with an x-ray free electron laser (XFEL). This amounts to performing a …

X-ray polarimetry, sometimes alone, and sometimes coupled to spectral and temporal
variability measurements and to imaging, allows a wealth of physical phenomena in …