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Proceedings Paper

Na variability and LGS elongation: impact on wavefront error
Author(s): Katharine J. Jones
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Paper Abstract

Variation in density structure and altitude of mesospheric sodium impacts the performance of Adaptive Optics (AO). With large entrance apertures, Laser Guide Stars (LGS) are seen as cylinders with an intensity structure that reflects the density structure of the sodium layers. Such elongation spreads the sodium light over more WaveFront Sensor (WFS) pixels and reduces the signal to noise ratios. This effect is proportional to the square of the telescope diameter: 30 m for TMT and 42 m for E-ELT. NA variability is examined and the resulting elongation analyzed for impact on WaveFront Error. TMT and E-ELT will be compared for methods being applied to mitigate LGS elongation to reduce resulting WaveFront Error.

Paper Details

Date Published: 16 September 2011
PDF: 9 pages
Proc. SPIE 8149, Astronomical Adaptive Optics Systems and Applications IV, 81490E (16 September 2011); doi: 10.1117/12.890296
Show Author Affiliations
Katharine J. Jones, WBAO (United States)

Published in SPIE Proceedings Vol. 8149:
Astronomical Adaptive Optics Systems and Applications IV
Robert K. Tyson; Michael Hart, Editor(s)

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