Want to improve your cascade 2-stage AO system? Turn it into a high-performance woofer-tweeter!

Henri-François Raynaud (1) , Caroline Kulcsár (1) , Nelly Cerpa-Urra (1) , Markus Kasper (2)

1 Laboratoire Charles Fabry / Imagerie et Information
2 ESO - European Southern Observatory

2-stage cascade AO (CAO) systems enable to improve wavefront correction for high-contrast exoplanet imaging. However, 1 st stage residuals entering the 2 nd stage exhibit see-saw high-frequency oscillations. We propose a compensation procedure which turns the CAO into a woofer-tweeter configuration, thus significantly improving overall performance.

Domains: Instrumentation and Methods for Astrophysic [astro-ph.IM]; Automatic; Optics / Photonic

Henri-François Raynaud, Caroline Kulcsár, Nelly Cerpa-Urra, Markus Kasper. Want to improve your cascade 2-stage AO system? Turn it into a high-performance woofer-tweeter!. Adaptive Optics and Applications, Technical Digest Series, pp.OTh4B.1, 2022, ⟨10.1364/AOA.2022.OTh4B.1⟩. ⟨hal-04545735⟩