title: Generation of hollow beams by spiral rays in multimode light guides.
abstract: The generation of hollow beams by a multimode light guiding device is analyzed. The light propagation through the light guide is simulated by ray tracing. It is shown that hollow beams are generated by light rays that propagate along a spiral path through the light guide. The properties of the hollow beam depend on the tilt angle and location of the input beam on the front surface of the light guide. The properties of the output beam are investigated experimentally.
authors.affiliation: Department of Mechanical Engineering, Laser Applications Technology, Ruhr-University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany. schweiger@lat.rub.de
authors.forename: Gustav
authors.initials: G
authors.lastname: Schweiger
authors.forename: Ralf
authors.initials: R
authors.lastname: Nett
authors.forename: Bilal
authors.initials: B
authors.lastname: Ozel
authors.forename: Thomas
authors.initials: T
authors.lastname: Weigel