Related Experiment Video
Updated: Jun 22, 2026
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Optical vortex metrology based on the core structures of phase singularities in Laguerre-Gauss transform of a speckle
Wei Wang1, Tomoaki Yokozeki, Reika Ishijima
1Laboratory for Information Photonics and Wave Signal Processing, Department of Information and Communication Engineering, The University of Electro-Communications, 1-5-1, Chofugaoka, Chofu, Tokyo 182-8585, Japan. weiwang@ice.uec.ac.jp
Abstract:
A new technique for displacement measurement is proposed that makes use of phase singularities in the complex signal generated by a Laguerre-Gauss filter operation applied to a speckle pattern. The core structures of phase singularities are used as unique fingerprints attached to the object surface, and the displacement is determined by tracing the movement of registered phase singularities with their correspondence being identified by the fingerprints. Experimental results for translational and rotational displacement measurements are presented that demonstrate large dynamic range and high spatial resolution of the proposed optical vortex metrology.
