Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

Yong Li; Mengyu Zhou; Dawei Li; Jianlang Li; Junyong Zhang

doi:10.1117/12.2638353

15 November 2022 Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

Yong Li, Mengyu Zhou, Dawei Li, Jianlang Li, Junyong Zhang

Proceedings Volume 12448, 5th Optics Young Scientist Summit (OYSS 2022); 124480Y (2022) https://doi.org/10.1117/12.2638353
Event: 5th Optics Young Scientist Summit (OYSS 2022), 2022, Fuzhou, China

Abstract

Lateral Shearing Interferometer (LSI), as a kind of self-interference technology, can achieve high-precision wavefront sensing and phase imaging. Quadriwave Lateral Shearing Interferometry (QWLSI) divides the wavefront into four transverse dislocated beams by a checkerboard phase grating. The lateral-shearing interferogram of the four waves occurs on the image plane, and then the test wavefront is reconstructed. The reconstruction precision is determined by the shear ratio, thus the variable shear ratio can meet the requirement of the different measurement accuracy. Here we proposed variable-ratio lateral-shearing interferometry with a vortex-splitting grating. Different from the checkerboard grating, topological charge is first encoded into grating and is then optimized to obtain two shear ratios in the same interference setup. The proposed variable-ratio lateral-shearing setup including of only an axial motion device is robust, effective and variable precision for wavefront sensing.

Citation Download Citation

Yong Li, Mengyu Zhou, Dawei Li, Jianlang Li, and Junyong Zhang "Variable-ratio lateral-shearing interferometry with a vortex-splitting grating", Proc. SPIE 12448, 5th Optics Young Scientist Summit (OYSS 2022), 124480Y (15 November 2022); https://doi.org/10.1117/12.2638353

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KEYWORDS

Diffraction gratings

Interferometry

Wavefronts

Diffraction

Wavefront sensors

Lithium

Optical simulations

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