Optical design and performance analysis of a 25 m class telescope with a segmented spherical primary.

Mette Owner-Petersen

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The basic design and an analysis of the performance possibilities of a 25 m class optical telescope are presented here. The configuration consists of a 28 m segmented spherical primary M1 followed by three highly aspherical corrective mirrors M2, M3 and M4 which also deviate from cartesian shape. The construction is axially folded. The combination M1-M2 forms a focus in a coupling aperture in M4, and the combination M3-M4 relays this focus to the final focus behind M1 and M3. The combination M2-M3 images M1 on the segmented M4 to be used for correction of wavefront errors induced by M1 due to gravitational sag and windbuffeting. Several types of aspherical figuring of M2, M3 and M4 all resulting in a field performance better than characterized by a RMS spotradius smaller than 0.1 arcseconds within a full FOV of 21 arcminutes are presented.
Original languageEnglish
Title of host publicationOptical Telescopes of Today and Tomorrow: Following in the direction of Today and Tomorrow
Place of PublicationBellingham, Washington, USA
PublisherSPIE - The International Society for Optical Engineering
Publication date1996
Publication statusPublished - 1996
EventOptical Telescopes of Today and Tomorrow: Following in the Direction of Tycho Brahe - Landskrona/Hven, Sweden
Duration: 29 May 19962 Jun 1996


ConferenceOptical Telescopes of Today and Tomorrow

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