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.
© 2011 Optical Society of America
Original Manuscript: September 10, 2010
Revised Manuscript: November 23, 2010
Manuscript Accepted: December 5, 2010
Published: January 27, 2011
Céline Benoît-Pasanau, François Goudail, Pierre Chavel, Jean-Paul Cano, and Jérôme Ballet, "Reducing the diffraction artifacts while implementing a phase function on a spatial light modulator," Appl. Opt. 50, 509-518 (2011)