Abstract
Methods and instruments for controlling the roughness parameters of the optical surface profiles with different root-mean-square deviations σ at different stages of the technological processing are discussed. An infrared laser interferometry method has been developed and justified, which is based on the Kirchhoff approximation upon scattering of plane electromagnetic wave λ by a phase screen under condition σ ⪢ λ. The analytical relation between the contrast of the video image of an interference pattern recorded with a designed unequal-arm Twyman–Green interferometer with a working wavelength of 10.6 μm and the root-mean-square deviation has been obtained. The dynamic interferometry technique for controlling local nanometer deviations of the surfaces of optical components from a specified profile has been implemented and experimentally confirmed for the case when σ ⪢ λ under the production vibration conditions using the algorithm for calculating the objective function: the 1D power spectral density. We report on the theoretical and experimental studies on the determination of the local root-mean-square deviations of the surfaces of optical parts with a diameter of up to 100 mm with regard to the nonexcluded systematic and random components of the objective function determination error.
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ACKNOWLEDGMENTS
The author is grateful to the researchers from the Research and Production Complex Astronomical and Space Optics and Lytkarino Optical Glass Plant for their help in conducting the experiments and competent consultations.
Funding
This work was supported in part by the Scholarship of the President of the Russian Federation to Young Scientists and Postgraduate Students Carrying out Promising Research and Development in the Priority Areas of Modernization of the Russian Economy for 2013–2015, order no. 136 of the Ministry of Science and Higher Education of the Russian Federation dated February 28, 2013.
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Denisov, D.G., Patrikeeva, A.A. Measuring the Roughness Parameters of Ground and Polished Optical Surfaces by High-Precision Laser Interferometry Methods. J. Commun. Technol. Electron. 67 (Suppl 1), S49–S65 (2022). https://doi.org/10.1134/S1064226922130046
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DOI: https://doi.org/10.1134/S1064226922130046