Titlebook: Astronomical Optics and Elasticity Theory; Active Optics Method Gérard René Lemaitre Book 2009 The Editor(s) (if applicable) and The Author

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Schmidt Correctors and Diffraction Gratings Aspherized by Active Optics,ure of these methods is the inherent . of the aspherized surface that is obtained directly from spherical or plane surfaces. This avoids the high spatial frequency errors which are a signature of the classical zonal retouch process. Active optics methods allow obtaining telescopes and astronomical instruments of the highest . image quality.

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Marlen Niederberger,Emily Finne)..The next problems for the primary mirror of large telescopes were to minimize their elastic deflection under . – or . – and also that resulting from . gradients. This latter problem was appropriately solved by the inventions and developments of low expansion materials such as Pyrex, Sitall, fused silica, vitrocerams, and silicon carbide.

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https://doi.org/10.1007/978-3-662-66673-9replaced by an on-axis refractive element. Kellner who patented in 1910 [25] several designs using a corrector lens, locates the plate in a wrong position for wide-field compensations. Schmidt placed the aspherical plate at the mirror center of curvature and emphasized the importance of this locatio

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Active Optics with Multimode Deformable Mirrors (MDM) Vase and Meniscus Forms,

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