Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Sodium beacon wavefront sensing for the Euro50 telescope in the presence of perspective elongation

In English

Författare

Redaktör

  • Arne L. Ardeberg
  • Torben Andersen

Summary, in English

To obtain full sky coverage, astronomical adaptive optics systemsrequire Na Sodium Beacons (SBs) (also referred to as Laser Guide Starsor LGSs) located at heights extending from 85 to 100 km. When viewed atthe edge of large telescopes these SBs appear elongated. For the Euro5050 meter aperture telecopes this elongation amounts to 6 to 9 arcsecondswhen the laser is launched from a point on the telescope axis. This issubstantially larger than the -0.6 arcsec FWHM SB when viewed near thetelescope center. This so-called "perspective elongation" substantiallydecreases the sensitivity of SB aided adaptive optics. We describe a wayof removing this elongation when using pulsed lasers. It uses rapid(microsecond) refocusing of the telescope with the aid of birefringentlenses and polarization modulators. We present an outline of the SBwavefront sensor for the Euro50.

Publiceringsår

2004

Språk

Engelska

Sidor

510-519

Publikation/Tidskrift/Serie

Proceedings of the SPIE

Volym

5382

Dokumenttyp

Konferensbidrag

Förlag

SPIE

Ämne

  • Astronomy, Astrophysics and Cosmology

Conference name

Second Backaskog Workshop on Extremely Large Telescopes

Conference date

0001-01-02

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 0-8194-5299-8