title: Fresnel diffraction on the edge of causality.
abstract: Taking advantage of the slow optical response of low-temperature rare earth ion-doped crystal, we explore the similarity between causality and Fresnel diffraction by a straight edge. We relate these features to spectral resolution and selectivity. The concept is illustrated with experimental data.
authors: L
authors: L
authors: Mãnager
authors: I
authors: I
authors: Lorgerë
authors: J L
authors: JL
authors: Le Gouãt