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Toward practical weak measurement wavefront sensing: spatial resolution and achromatism

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Abstract

The weak measurement wavefront sensor detects the phase gradient of light like the Shack–Hartmann sensor does. However, the use of one thin birefringent crystal to displace light beams results in a wavelength-dependent phase difference between the two polarization components, which limits the practical application. Use of a Savart plate, which consists of two such crystals, can compensate for the phase difference and realize achromatic wavefront sensing when combined with an achromatic retarder. We discuss the spatial resolution of the sensor and experimentally reconstruct a wavefront modulated by a pattern. Then we obtain the Zernike coefficients with three different wavelengths before and after modulation. Our work makes this new wavefront sensor more applicable to actual tasks like biomedical imaging.

© 2022 Optica Publishing Group

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Corrections

23 May 2022: A typographical correction was made to p. 2735.


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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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