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Adaptive optics
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== Tip–tilt correction == The simplest form of adaptive optics is ''tip–tilt correction'',<ref> {{cite conference |last=Watson |first=Jim |date=April 17, 1997 |title=Tip-Tilt Correction for Astronomical Telescopes using Adaptive Control |conference=Wescon – Integrated Circuit Expo 1997 |url=http://www.osti.gov/bridge/servlets/purl/647009-7dL5F4/webviewable/647009.pdf }}</ref> which corresponds to correction of the [[Tilt (optics)|tilts]] of the wavefront in two dimensions (equivalent to correction of the position offsets for the image). This is performed using a rapidly moving tip–tilt mirror that makes small rotations around two of its axes. A significant fraction of the [[Optical aberration|aberration]] introduced by the [[atmosphere]] can be removed in this way.<ref name=":0">{{Cite web |title=Adaptive Optics without trouble {{!}} Technical articles {{!}} Technical documents |url=http://www.okotech.com/adaptive-optics-without-trouble |access-date=2023-06-10 |website=www.okotech.com}}</ref> Tip–tilt mirrors are effectively [[segmented mirror]]s having only one segment which can tip and tilt, rather than having an array of multiple segments that can tip and tilt independently. Due to the relative simplicity of such mirrors and having a large stroke, meaning they have large correcting power, most AO systems use these, first, to correct low-order aberrations. Higher-order aberrations may then be corrected with deformable mirrors.<ref name=":0" />
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