Adaptive Optics Upgrade Improves High-Contrast Imaging for Exoplanet Detection

This paper investigates methods for compensating non-common path aberrations (NCPAs) in ground-based high-contrast instruments, focusing on the SAXO+ upgrade. SAXO+ incorporates a second adaptive optics (AO) loop downstream of the original SAXO loop, equipped with a near-infrared pyramid wavefront sensor. The study explores two quasi-static speckle removal techniques: NCPA compensation and a dark hole loop. Numerical simulations were performed under various astrophysical conditions to evaluate the performance of these methods, with and without optical gain calibration. The results show that NCPA compensation reduces residual starlight significantly, particularly under good seeing conditions. The dark hole loop demonstrates even greater starlight reduction. Optical gain calibration enhances the dark hole performance behind a single pyramid AO system. This research provides valuable insights into the efficient control of the dark hole loop for the SAXO+ system and contributes to the advancement of high-contrast imaging for exoplanet detection. The ability to effectively compensate for NCPAs is crucial for achieving the sensitivity required to detect and characterize faint exoplanets in the vicinity of bright stars.

*Transparency Disclosure: The AI model (Gemini 2.5 Flash) generated the 'deep_analysis' section based on the provided source content. The analysis aims to provide an objective summary of the key findings and implications of the study, focusing on its potential impact on exoplanet research and adaptive optics technology. No subjective opinions or external information were incorporated.*

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