Reconstructing the topology of optical vortex lines with single-shot measurement

We propose and demonstrate a method for reconstructing the topology of optical vortex lines by utilizing digital holography. Compared with the traditional methods that need complicated spatial scanning procedure, the proposed method only requires a single exposure of hologram. It enables this method to be particularly well suited to observe the dynamic change of vortex topology. With the method, we experimentally reconstructed the dynamically rotating three-dimensional topology. These results are expected to provide a powerful tool for the experimental observation of the dynamical evolution of light fields and can be used to improve efficiency in information demodulation of topology carrying beams.