УДК: 535.4, 681.7.02-04, 681.787

Automatic aspherization of off-axis highly aspheric surfaces of large optical items

Semenov, A.P., Abdulkadyrov, M.A., Dobrikov, N.S., Ignatov, A.N., Patrikeev, V.E., Papaev, A.Y., Polyanshchikov, A.V., Pridnya, V.V.

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Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Семенов А.П., Абдулкадыров М.А., Добриков Н.С., Игнатов А.Н., Патрикеев В.Е., Папаев А.Ю., Полянщиков А.В., Придня В.В. Автоматизированная асферизация внеосевых высокоасферичных поверхностей крупногабаритных оптических деталей // Оптический журнал. 2017. Т. 84. № 11. С. 62–68.

Semenov A.P., Abdulkadyrov M.A., Dobrikov N.S., Ignatov A.N., Patrikeev V.E., Papaev A.Yu., Polyanshchikov A.V., Pridnya V.V. Automatic aspherization of off-axis highly aspheric surfaces of large optical items [in Russian] // Opticheskii Zhurnal. 2017. V. 84. № 11. P. 62–68.

For citation (Journal of Optical Technology):

A. P. Semenov, M. A. Abdulkadyrov, N. S. Dobrikov, A. N. Ignatov, V. E. Patrikeev, A. Yu. Papaev, A. V. Polyanshchikov, and V. V. Pridnya, "Automatic aspherization of off-axis highly aspheric surfaces of large optical items," Journal of Optical Technology. 84(11), 767-772 (2017). https://doi.org/10.1364/JOT.84.000767

Abstract:

The development of shaping technology, which may involve the use of an automatic system with software control and a set of special tools, makes it possible to aspherize large off-axis optical elements of astronomical and space-based telescopes in which the deviation from the nearest sphere is greater than 1 mm. This paper discusses an example of the automatic shaping of an off-axis mirror 560 mm in diameter with asphericity 200 μm in which the surface shape is monitored with a diffraction optical element. A method is considered for preliminary aspherization of an off-axis segment of a composite mirror 1520 mm in diameter, involving the elastic deformation of a segment, followed by automatic finishing. The paper presents the results of aspherization for the Millimetron telescope project, using automatic milling, grinding, and polishing of convex off-axis elements made from Astrositall with more than 1 mm asphericity.

Keywords:

telescope, glass ceramics, Astrositall, astronomical mirrors, lightened mirror, timing and deformation stability

OCIS codes: 220.0220; 220.0230; 220.4610; 350.1260

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