Exploring the operational effects of phase diversity for the calibration of non-common path errors on NFIRAOS

Masen Lamb; Carlos Correia; Jean-François Sauvage; David Andersen; Jean-Pierre Véran

doi:10.1117/12.2233043

27 July 2016 Exploring the operational effects of phase diversity for the calibration of non-common path errors on NFIRAOS

Masen Lamb, Carlos Correia, Jean-François Sauvage, David Andersen, Jean-Pierre Véran

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 99096E (2016) https://doi.org/10.1117/12.2233043
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We propose two methods to characterize the Non-Common Path Aberrations (NCPA) on the TMT/NFIRAOS system; these techniques are known as Phase Diversity and Focal Plane Sharpening. We demonstrate the feasibility of these techniques on an experimental bench. We also explore the operational effects of Phase Diversity and how it might be best applied to a NFIRAOS-like system. In particular we explore the technique of single image Phase Diversity along with the effects of i) estimating either Zernike modes or Disk Harmonics, ii) using multiple diverse images, and iii) using diversities other than focus. These operational considerations are explored in a simulation of the NFIRAOS system and we aim to find the best estimation of the NFIRAOS NCPA in the presence of different levels of noise. We find a realistic estimation of NFIRAOS NCPA would be with multi-image Phase Diversity - with focus-diverse images sampled at asymmetric positions on either side of the focal plane (with no estimation of the object).

Citation Download Citation

Masen Lamb, Carlos Correia, Jean-François Sauvage, David Andersen, and Jean-Pierre Véran "Exploring the operational effects of phase diversity for the calibration of non-common path errors on NFIRAOS", Proc. SPIE 9909, Adaptive Optics Systems V, 99096E (27 July 2016); https://doi.org/10.1117/12.2233043

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