22 July 2014 New strategies for an extremely large telescope dedicated to extremely high contrast: the Colossus project
Author Affiliations +
Detecting an exoplanetary life signal is extremely challenging with current technology because it requires a sensitive telescope and instrument that can measure the planet's reflected optical and infrared light, while distinguishing this from the star's scattered light and the terrestrial thermal noise background. This requires highly accurate adaptive optics, a coronagraph system, and a specially designed and aligned giant telescope. We present here new strategies for building such a telescope with large circular segments using adaptive optics correction independently for each of these segments prior to cophasing the segments. The foreseen cophasing technique uses focal plane images that allow piston measurements and correction between all the segments. In this context we propose to derive the segment phase error using the inverse approach knowing the segment positions and the single aperture Airy function.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gil Moretto, Jeff R. Kuhn, Eric Thiébaut, Maud Langlois, Svetlana V. Berdyugina, Caisey Harlingten, David Halliday, "New strategies for an extremely large telescope dedicated to extremely high contrast: the Colossus project", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451L (22 July 2014); doi: 10.1117/12.2055797; https://doi.org/10.1117/12.2055797


Optical performance and phase error budgeting of future ELTs
Proceedings of SPIE (September 16 2004)
Distributed pupil telescope designs
Proceedings of SPIE (January 30 2003)
Segmented telescopes for coronagraphs
Proceedings of SPIE (October 12 2004)
Diffraction effects with segmented apertures
Proceedings of SPIE (August 28 1998)
The SOLARC off-axis coronagraph
Proceedings of SPIE (February 11 2003)

Back to Top