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Low light level quadriwave lateral shearing interferometer for in-situ wavefront sensing
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Paper Abstract

The environment of a balloon based telescope puts opto-mechanical stability demands that wavefront sensing and focus control are important features to consider. The GHAPS telescope is designed to correct for rigid body motion of the secondary mirror based upon wavefront sensing from reference stars. In order to support the concept of operations of this approach, the precision of wavefront sensing with candidate reference stars needs to be addressed. Precision is expected to degrade with reduction in irradiance. To confirm this, a study was conducted to determine the relationship between broadband and narrow spectral irradiance and wavefront measurement precision. The results of the study demonstrate that a precision of 5 nm RMS can be achieved with a 20 x 20 sampling of the wavefront with an irradiance of a visual magnitude 5 star on 1 meter aperture with an exposure of 30 msec.

Paper Details

Date Published: 11 July 2018
PDF: 11 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107035J (11 July 2018); doi: 10.1117/12.2312331
Show Author Affiliations
Brian Catanzaro, CFE Services (United States)
Benoit Wattellier, PHASICS S.A. (France)
Ekaterina Boldyreva, PHASICS S.A. (France)
Eliot Young, Southwest Research Institute (United States)
Michael Lewis, NASA Glenn Research Ctr. (United States)
Jeffrey Juergens, NASA Glenn Research Ctr. (United States)
Robert Woodruff, Robert Woodruff Consulting (United States)
Monica Hoffmann, NASA Glenn Research Ctr. (United States)

Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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