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.
© 2003 Optical Society of America
Narupon Chattrapiban, Elizabeth A. Rogers, David Cofield, Wendell T. Hill, III, and Rajarshi Roy, "Generation of nondiffracting Bessel beams by use of a spatial light modulator," Opt. Lett. 28, 2183-2185 (2003)