Combining spatially filtered Shack-Hartmann wavefront sensing and coronography in closed loop AO simulations

Visa Korkiakoski; Miska Le Louarn; Christophe Verinaud

doi:10.1117/12.551084

25 October 2004 Combining spatially filtered Shack-Hartmann wavefront sensing and coronography in closed loop AO simulations

Visa Korkiakoski, Miska Le Louarn, Christophe Verinaud

Author Affiliations +

Proceedings Volume 5490, Advancements in Adaptive Optics; (2004) https://doi.org/10.1117/12.551084
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

We made complete end-to-end adaptive optics (AO) simulations to model the closed loop performance with and without pupil apodization, a spatially filtered wavefront sensor (SF-WFS) and a coronagraph. We investigated the SF performance (the Strehl ratio and the stellar intensity reduction in the halo) with several configurations in different seeing conditions. We also ran several extensive coronagraph simulations modeling a 32m telescope to obtain an investigate the exoplanet detection possibilities. The results show that a four-quadrant phase mask coronagraph can damp the intensity about 10⁵ times from the original intensity at seeing conditions having r₀=20 cm at 0.5μm. When the SF is used, an additional intensity reduction of about 50-70% can be obtained.

Citation Download Citation

Visa Korkiakoski, Miska Le Louarn, and Christophe Verinaud "Combining spatially filtered Shack-Hartmann wavefront sensing and coronography in closed loop AO simulations", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); https://doi.org/10.1117/12.551084

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