title: Bessel-like beams with z-dependent cone angles.
abstract: The conventional means of generating Bessel-Gauss beams by axicons in the laboratory results in the distinct disadvantage of an abrupt change in intensity at the boundary of the non-diffracting region. We outline theoretically and then demonstrate experimentally a concept for the creation of Bessel-like beams that have a z-dependent cone angle, thereby allowing for a far greater quasi non-diffracting propagation region.
authors.affiliation: BI Stepanov Institute of Physics, NASB, 68, Nezavisimosti ave, 220072 Minsk, Belarus. lod@dragon.bas-net.by
authors.forename: Vladimir
authors.initials: V
authors.lastname: Belyi
authors.forename: Andrew
authors.initials: A
authors.lastname: Forbes
authors.forename: Nikolai
authors.initials: N
authors.lastname: Kazak
authors.forename: Nikolai
authors.initials: N
authors.lastname: Khilo
authors.forename: P
authors.initials: P
authors.lastname: Ropot