title: Generation of femtosecond diffraction-compensated beam through an opaque disk.
abstract: The generation of a femtosecond diffraction-compensated beam through an opaque disk is presented: 100 fs pulses are focused in the vicinity of an opaque disk. A bright beam surrounded by concentric rings is generated. The beam can be collimated by a lens. A non-diffracting femtosecond beam which conserves a 500microm large central spot over more than 1.7m is then observed, without any nonlinear mechanism. Our theoretical analysis predicts well the results.
authors.affiliation: Groupe d'Optique et d'Optronique, CORIA UMR 6614, Université de Rouen, 76801 Saint Etienne du Rouvray Cedex, France. marc.brunel@coria.fr
authors.forename: Marc
authors.initials: M
authors.lastname: Brunel
authors.forename: Driss
authors.initials: D
authors.lastname: Mgharaz
authors.forename: Sebastien
authors.initials: S
authors.lastname: Coetmellec