title: Double helical laser beams based on interfering first-order Bessel beams.
abstract: We demonstrate the generation of a nondiffracting double helical beam using axicons and ±1 vortex phase plates in a common-path interferometric system. Using linear diffraction theory, a simple analytical expression describing beam propagation is shown to agree with both experiments and Fresnel-diffraction-based simulations. Experiments are performed using continuous laser light in addition to ultrafast pulses, demonstrating that the common-path arrangement and the diffraction theory work equally well for both cases.
authors: Townes Laser Institute, CREOL - The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.
authors: Nicholas
authors: N
authors: Barbieri
authors: Matthew
authors: M
authors: Weidman
authors: Gregory
authors: G
authors: Katona
authors: Matthieu
authors: M
authors: Baudelet
authors: Zachary
authors: Z
authors: Roth
authors: Eric
authors: E
authors: Johnson
authors: Georgios
authors: G
authors: Siviloglou
authors: Demetrios
authors: D
authors: Christodoulides
authors: Martin
authors: M
authors: Richardson