Dr. Lian Zhang Profile

Dr. Lian Zhang

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Proceedings Article | 12 October 2020 Poster + Paper

Singular skeleton in speckle field

Haibin Sun, Tingting Liu, Jun Chen, Lian Zhang, Ping Sun

Proceedings Volume 11551, 115511T (2020) https://doi.org/10.1117/12.2575342

KEYWORDS: Speckle, Laser scattering, Speckle pattern, Wavefronts, Optical testing, Light scattering, Scattering, Random lasers, Singular optics, Phase measurement

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Phase extraction and applications of the speckle vortex field with spiral wavefront and stable core structures of phase singularities has become an important research content in the field of optical measurement. Phase singularities in the speckle field constitute singular skeleton. We use an experimental system to measure the deformation displacement based on the singular skeleton. In the experiment, a liquid crystal spatial light modulator (LC–SLM) is used to generate speckle field, and the output speckle image is captured by the CCD camera. By processing the speckle pattern, the singular skeleton of the speckle field is depicted. Based on the singular skeleton, the deformation translational displacement of the test sample is obtained. The experimental results show that high-resolution optical measurement methods can be developed based on the singular skeleton of the speckle field.

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