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Proceedings Paper

AIR FLOW: airborne interferometric recombiner fluctuations of light at optical wavelengths
Author(s): Olivier Lai; Mark R. Chun; Kanoa Withington
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Paper Abstract

The local turbulence is the only part of the seeing degradation that we can actively improve and reduce at the source. It is often a major contribution to the overall seeing1,2 and introduces effects that are highly localized and may be difficult to correct. For example, dome seeing is expected to be non-Kolmogorov, with a very small outer scale leading to a preponderance of high spatial frequencies. The first step in controlling the local seeing is to locate and quantify the turbulence present. This requires the development of a new type of sensor, specifically designed to sensitively measure local optical turbulence. We are in the process of developing such a sensor, based on a simple Mach-Zehnder interferometer layout. The sensor will be light and ruggedized so that it can be used to map out the turbulence inside the dome of any telescope, inside the telescope tube and even around the dome building. Eventually, such a sensor may be used to quantitatively and actively control dome vents.

Paper Details

Date Published: 27 July 2016
PDF: 6 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99093H (27 July 2016); doi: 10.1117/12.2233833
Show Author Affiliations
Olivier Lai, Lab. Lagrange, Univ. de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Mark R. Chun, Univ. of Hawaii (United States)
Kanoa Withington, Canada France Hawaii Telescope (United States)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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