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DIFFRACTIVE OPTICS, OPTICAL TECHNOLOGIES
Measurement of the radius of curvature of a spherical surface based on the transport-of-intensity equation
N. G. Stsepuroa, M. S. Kovalyova, G. K. Krasina, I. V. Gritsenkoa, A. V. Bobkovab, S. I. Kudryashovc a Bauman Moscow State Technical University
b R\&D Geofizika-Cosmos
c P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow
Abstract:
The transport-of-intensity equation provides a new non-interferometric and non-iterative access to quantitative information about the phase of a light wave by measuring intensity distributions. This equation can be used to implement a simple and accurate spatial phase measurement for optical testing of spherical surfaces. The method requires only a CMOS camera, which records transverse field intensity distributions in several planes. Processing of experimental measurements with specialized software allows one to reconstruct the value of the radius of curvature of the spherical surface under test with high accuracy. The method is compared with measurements made by an interferometer, showing the difference between the values of the surface radius of curvature to be 0.01% or less and indicating good agreement of the results.
Keywords:
laser beam; wavefront; measurement radius of curvature of a spherical surface; phase distortions; transport-of-intensity equation
Received: 18.05.2022 Accepted: 30.06.2022
Citation:
N. G. Stsepuro, M. S. Kovalyov, G. K. Krasin, I. V. Gritsenko, A. V. Bobkov, S. I. Kudryashov, “Measurement of the radius of curvature of a spherical surface based on the transport-of-intensity equation”, Computer Optics, 46:6 (2022), 877–883
Linking options:
https://www.mathnet.ru/eng/co1081 https://www.mathnet.ru/eng/co/v46/i6/p877
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