1.
J Opt Soc Am A Opt Image Sci Vis
; 28(7): 1462-9, 2011 Jul 01.
Article
in English
| MEDLINE
| ID: mdl-21734746
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.