Sodium beacon wavefront sensing for the Euro50 telescope in the presence of perspective elongation
(2004) Second Backaskog Workshop on Extremely Large Telescopes 5382. p.510-519- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/528501
- author
- Beckers, Jacques M. ; Owner-Petersen, Mette LU and Andersen, Torben LU
- organization
- publishing date
- 2004
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Proceedings of the SPIE
- editor
- Ardeberg, Arne L. and Andersen, Torben
- volume
- 5382
- pages
- 510 - 519
- publisher
- SPIE
- conference name
- Second Backaskog Workshop on Extremely Large Telescopes
- conference dates
- 0001-01-02
- external identifiers
-
- scopus:5444229878
- ISBN
- 0-8194-5299-8
- DOI
- 10.1117/12.566229
- language
- English
- LU publication?
- yes
- id
- bdd43380-5872-45d3-b19e-ef51a5178535 (old id 528501)
- date added to LUP
- 2016-04-04 10:05:01
- date last changed
- 2024-01-12 18:46:01
@inproceedings{bdd43380-5872-45d3-b19e-ef51a5178535, abstract = {{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.}}, author = {{Beckers, Jacques M. and Owner-Petersen, Mette and Andersen, Torben}}, booktitle = {{Proceedings of the SPIE}}, editor = {{Ardeberg, Arne L. and Andersen, Torben}}, isbn = {{0-8194-5299-8}}, language = {{eng}}, pages = {{510--519}}, publisher = {{SPIE}}, title = {{Sodium beacon wavefront sensing for the Euro50 telescope in the presence of perspective elongation}}, url = {{http://dx.doi.org/10.1117/12.566229}}, doi = {{10.1117/12.566229}}, volume = {{5382}}, year = {{2004}}, }