Minimization of CaF_2 spherical surface deformation caused by annealing

Frantisek Prochaska; Matej Machek; Jan VaclavikVasyl Karabyn

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Minimization of CaF_2 spherical surface deformation caused by annealing

机译：Minimization of CaF_2 spherical surface deformation caused by annealing

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We explore causes and possible techniques to minimize shape deformation of high-precision monocrystalline calcium fluoride optical surface formed during thermal annealing. Due to the anisotropic mechanical properties of calcium fluoride crystals, machining of lens shapes introduces defects into the crystal lattice. The thermal annealing thus leads to activation of the processes of recovery, resulting in the formation of characteristic surface structures causing both shape error and increased microroughness. The surface deformation can be gradually minimized by thermal treatment of the optical element and subsequent polishing steps to the order of units of nanometers, so they do not represent a fundamental problem for optical performance.

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来源
《Optical Engineering》 |2021年第11期|115101-1-115101-9|共9页
作者
Frantisek Prochaska; Matej Machek; Jan VaclavikVasyl Karabyn;
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作者单位

TOPTEC, Institute of Plasma Physics of the Czech Academy of Sciences, Sobotecka, Turnov, Czech Republic;

Institute of Geophysics of the Czech Academy of Sciences, Bocni II, Prague, Czech Republic;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
关键词
CaF_2 processing; CaF_2 crystallography; CaF_2 residual stress; CaF_2 annealing;

Minimization of CaF_2 spherical surface deformation caused by annealing

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