PARALLEL GLASS PLATE TEST WITH THE USE OF THE PHASE SHIFT TECHNIQUE IN THE OPTICAL VORTEX INTERFEROMETER

摘要

The Optical Vortex Interferometer (OVI) is described in earlier paper as usefully tool to generate regular lattice of optical vortices (OVs) by interference of three plane wave. To practically use OVI in metrology method to localization of vortex points (VPs) is necessary. In this paper method with phase shift technique to VPs localisation is presented. Phase shift technique in this method is applied to additional fourth wave. Phase shift of the fourth wave doesn't change intensity in vortex points and increases intensity gradient in their vicinity. Result of localisation can be useful to analyse wave-front deformation caused by the object inserted in OVI setup.