Preliminary closed-loop performance of the adaptive optics for the Evanescent Wave Coronagraph prototype

Apichayaporn Ratkata; Anthony Berdeu; Patcharadanai Sombatsatien; Krittapat Bannajak; Mary Angelie M. Alagao; Michel Tallon; Éric Thiébaut; Maud Langlois; Thansita Thomrungpiyathan; Thierry Lepine; Supachai Awiphan; Saran Poshyachinda; Wiphu Rujopakarn; Christophe Buisset

doi:10.1117/12.3019455

27 August 2024 Preliminary closed-loop performance of the adaptive optics for the Evanescent Wave Coronagraph prototype

Apichayaporn Ratkata, Anthony Berdeu, Patcharadanai Sombatsatien, Krittapat Bannajak, Mary Angelie M. Alagao, Michel Tallon, Éric Thiébaut, Maud Langlois, Thansita Thomrungpiyathan, Thierry Lepine, Supachai Awiphan, Saran Poshyachinda, Wiphu Rujopakarn, Christophe Buisset

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130973D (2024) https://doi.org/10.1117/12.3019455
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Evanescent Wave Coronagraph (EvWaCo) exploits the frustration of the total internal reflection (FTIR) between a prism and a lens put in contact. The starlight is transmitted through the contact area while the light from the companion is reflected. An EvWaCo prototype, equipped with an adaptive optics (AO) system, will be installed at the 2.4m Thai National Telescope as an on-sky demonstrator of the EvWaCo mask’s achromatic capabilities while testing new AO control techniques. To characterize the Extreme Adaptive Optics System (XAO) for this prototype, we developed a bench equipped with a DM192 ALPAO deformable mirror, a 15×15 sub-apertures Shack-Hartmann wavefront sensor (SH-WFS), and a two-track phase plate simulating an average seeing of 1.4" at the Thai National Telescope, and the best seeing at 1.00". Following our previous communications on the characterization of the DM and the phase plate, we present how we calibrate the sensor for the WFS and the interaction matrix. This paper presents preliminary results obtained from experiments after closing the loop using a leaky integrator.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Apichayaporn Ratkata, Anthony Berdeu, Patcharadanai Sombatsatien, Krittapat Bannajak, Mary Angelie M. Alagao, Michel Tallon, Éric Thiébaut, Maud Langlois, Thansita Thomrungpiyathan, Thierry Lepine, Supachai Awiphan, Saran Poshyachinda, Wiphu Rujopakarn, and Christophe Buisset "Preliminary closed-loop performance of the adaptive optics for the Evanescent Wave Coronagraph prototype", Proc. SPIE 13097, Adaptive Optics Systems IX, 130973D (27 August 2024); https://doi.org/10.1117/12.3019455

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