Chattrapiban Narupon, Rogers Elizabeth A, Cofield David, Hill Wendell T, Roy Rajarshi
Department of Physics, Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA.
Opt Lett. 2003 Nov 15;28(22):2183-5. doi: 10.1364/ol.28.002183.
A laser beam with phase singularities is an interesting object to study in optics and may have important applications in guiding atoms and molecules. We explore the characteristics of a singularity in a nondiffracting Bessel beam experimentally by use of a programmable spatial light modulator with 64-level phase holograms. The diffraction efficiency with 64-level phase holograms is greatly improved in comparison with that obtained with a binary grating. The experiments show that the size and deflection angle of the beam can be controlled in real time. The observations are in agreement with scalar diffraction theory.
