Two-frame wavefront reconstruction method with nonlinear optimization for Ronchi lateral shearing interferometry

Shi, Runzhou; Liu, Huiwen; Shao, Yuqi; Zhang, Tian; Bai, Jian

doi:10.1016/j.optcom.2024.130359

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Cited by 3 publications

References 26 publications

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Noise model and suppression algorithm for high-precision wavefront detection

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Optical Design and Testing XIV

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Improved Ronchi lateral-shearing interferometry based on sinusoidal amplitude grating

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Lateral shearing interferometry method based on double-checkerboard grating by suppressing aliasing effect

Liu,

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Ronchi lateral shearing interferometry is a promising wavefront sensing technology with the advantages of simple structure and no reference light, which can realize a high-precision wavefront aberration measurement. To obtain shear information in both directions, the conventional double-Ronchi interferometer sequentially applies two orthogonal one-dimensional Ronchi gratings as the object-plane splitting element of the optics under test. Simultaneously, another Ronchi grating is positioned on the image plane in the same orientation to capture two sets of interferograms, thereby enabling two-dimensional wavefront reconstruction. Mechanical errors will inevitably be introduced during grating conversion, affecting reconstruction accuracy. Based on this, we propose a lateral shearing interferometry applying double-checkerboard grating. Only unidirectional phase shift is needed to obtain shear information in two directions while evading the grating conversion step, aiming to streamline operational processes and mitigate the potential for avoidable errors. We employ scalar diffraction theory to analyze the full optical path propagation process of the double-checkerboard shearing interferometry and introduce a new reconstruction algorithm to effectively extract the two-dimensional shear phase by changing the grating morphology, suppressing the aliasing effect of irrelevant diffraction orders. We reduce the fitting error through iterative optimization to realize high-precision wavefront reconstruction. Compared with conventional Ronchi lateral shearing interferometry, the proposed method exhibits better robustness and stability in noisy environments.

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Two-frame wavefront reconstruction method with nonlinear optimization for Ronchi lateral shearing interferometry

Cited by 3 publications

References 26 publications

Noise model and suppression algorithm for high-precision wavefront detection

Noise model and suppression algorithm for high-precision wavefront detection

Improved Ronchi lateral-shearing interferometry based on sinusoidal amplitude grating

Lateral shearing interferometry method based on double-checkerboard grating by suppressing aliasing effect

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