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Proceedings Paper

DOT++: the Dutch Open Telescope with 1.4-m aperture
Author(s): Felix C.M. Bettonvil; Robert H. Hammerschlag; Peter Sutterlin; Robert J. Rutten; Aswin P.L. Jagers; Frans Snik
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Paper Abstract

The Dutch Open Telescope (DOT; http://dot.astro.uu.nl) on La Palma is a revolutionary open solar telescope, on an excellent site, on top of a transparent steel tower, and uses natural air flow to minimize local seeing. The aim is long-duration high-resolution imaging with a multi-wavelength camera system. In order to achieve this, the DOT is equipped with a diffraction limited imaging system and uses the speckle reconstruction technique for removing the remaining atmospheric turbulence. The DOT optical system is simple and consists currently of a 0.45m/F4.44 parabolic mirror and a 10x enlargement lens system. We present our plans to increase the aperture of the DOT from 0.45m to 1.4m. The mirror support and telescope top shall be redesigned, but telescope, tower, multi-wavelength camera system and speckle system remain intact. The new optical design permits user selectable choice between angular resolution and field size, as well as transversal pupil shift introducing the possibility to use obstruction free apertures up to 65cm. The design will include a low order AO system, which improves the speckle S/N substantially during moderate seeing conditions.

Paper Details

Date Published: 28 September 2004
PDF: 12 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.550479
Show Author Affiliations
Felix C.M. Bettonvil, Univ. Utrecht (Netherlands)
ASTRON (Netherlands)
Robert H. Hammerschlag, Utrecht Univ. (Netherlands)
Peter Sutterlin, Ultrecht Univ. (Netherlands)
Robert J. Rutten, Ultrecht Univ. (Netherlands)
Aswin P.L. Jagers, Utrecht Univ. (Netherlands)
Frans Snik, Utrecht Univ. (Netherlands)


Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann, Editor(s)

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