title: Reducing the diffraction artifacts while implementing a phase function on a spatial light modulator.
abstract: Spatial light modulators are often used to implement phase modulation. Since they are pixelated, the phase function is usually approximated by a regularly sampled piecewise constant function, and the periodicity of the pixel sampling generates annoying diffraction peaks. We theoretically investigate two pixelation techniques: the isophase method and a new nonperiodic method derived from the Voronoi tessellation technique. We show that, for a suitable choice of parameters, the diffraction peaks disappear and are replaced by a smoothly varying halo. We illustrate the potential of these two techniques for implementing a lens function and wavefront correction.
authors.affiliation: Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, Université Paris-Sud, Campus Polytechnique, Palaiseau, France.
authors.forename: Céline
authors.initials: C
authors.lastname: Benoît-Pasanau
authors.forename: François
authors.initials: F
authors.lastname: Goudail
authors.forename: Pierre
authors.initials: P
authors.lastname: Chavel
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Cano
authors.forename: Jérôme
authors.initials: J
authors.lastname: Ballet