MORFEO @ ELT: updates on the optical fine alignment strategy

Le résumé fourni par la source

MORFEO (Multi-conjugate adaptive Optics Relay For ELT Observations) is the post-focal adaptive optics module for the ESO Extremely Large Telescope. The instrument provides MCAO correction for two instruments: MICADO and HARMONI. Multiple MORFEO fine Optical Alignment strategies are currently under investigation. For this contribution, we report updates on the “Donut” method. In this approach, residual low order aberrations - due to misalignments - are estimated by calculating the moments of light in out-of-focus images on the instrumental focal plane detector. MORFEO’s M10, M11 and M12 can then be moved to compensate for those and align the pupil and focal planes between MORFEO and the attached instruments. We present several tests to assess the performances of this strategy, also accounting for stray light effects and demonstrating using more realistic “on-sky” donuts. This study is performed by means of sequential and non-sequential simulations with the Zemax software and its API.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.