Adaptive optics and multi-conjugate adaptive optics with the VTT
| Autor: | Friedrich Wöger, Th. Schelenz, Dirk Soltau, O. von der Lühe, Th. Berkefeld |
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| Rok vydání: | 2002 |
| Předmět: |
Wavefront
Physics Field (physics) business.industry Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Field of view Wavefront sensor Deformable mirror law.invention Telescope Cardinal point Optics Space and Planetary Science law Astrophysics::Solar and Stellar Astrophysics Adaptive optics business |
| Zdroj: | Astronomische Nachrichten. 323:236-240 |
| ISSN: | 1521-3994 0004-6337 |
| DOI: | 10.1002/1521-3994(200208)323:3/4<236::aid-asna236>3.0.co;2-y |
| Popis: | We are currently developing adaptive optics (AO) system with a multi-conjugate extension for the German solar vacuum tower telescope (VTT) at the Teide Observatory on Tenerife.Multi-conjugate adaptive optics (MCAO) is a technique for increasing the field of view by compensating atmospheric turbulence along several, adjacent lines of sight. A conventional AO system compensates only a single line of sight in the direction of the lock point of its wavefront sensor. At larger field angles, the light from the source transverses higher layers of turbulence which are not sampled by the conventional system. Measurements at the VTT indicate that full compensation is typically restricted to a field of about 10 arcsec in diameter at visible wavelengths. An MCAO uses (at least) a second deformable mirror close to the focal plane of the telescope to compensate a larger field. The sun is a privileged target for an MCAO because the wavefront errors at larger field angles are easily measured. We intend to extend our existing AO system with a second deformable mirror and a second wavefront sensor which enables us to extend the compensated field by a factor of three in diameter.We present and discuss our concept. |
| Databáze: | OpenAIRE |
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