Le Laboratoire d'Optique Appliquée (LOA) is an UMR (Unité Mixte de Recherches) ENSTA-Paris Tech - CNRS - École Polytechnique.

Its research activity covers a broad spectrum of science in the field of ultrafast lasers and their applications: development of intense laser sources, laser-matter interaction and plasma physics, production of compact sources of energetic radiations and particles, multidisciplinary applications of these sources.