title: Piston measurement by quadriwave lateral shearing interferometry.
abstract: We present what is to our knowledge a new method for measuring the relative piston between two independent beams separated by a physical gap, typical of petawatt facilities. The feasibility of this measurement, based on quadriwave lateral shearing interferometry, has been demonstrated experimentally: piston has been measured with accuracy and sensitivity better than 50 nm.
authors.affiliation: Commissariat à l'Energie Atomique, Centre d'Etudes Scientifiques et Techniques d'Aquitaine, Le Barp, France.
authors.forename: Soazic
authors.initials: S
authors.lastname: Mousset
authors.forename: Claude
authors.initials: C
authors.lastname: Rouyer
authors.forename: Gabrielle
authors.initials: G
authors.lastname: Marre
authors.forename: Nathalie
authors.initials: N
authors.lastname: Blanchot
authors.forename: Sébastien
authors.initials: S
authors.lastname: Montant
authors.forename: Benoit
authors.initials: B
authors.lastname: Wattellier