3 papers
astro-ph.IM2026
Gratis Mitigation of Polarization Aberration Effects in Coronagraphic Dark Holes
Richard A. Frazin
Direct imaging of exoplanets requires stellar coronagraphs capable of suppressing starlight to contrast levels below . Active wavefront control with deformable mirrors (DM…
astro-ph.IM2025
Instrumental Polarization in Stellar Coronagraphy: Coherent Behavior and its Implications for Dark Hole Optimization
Richard A. Frazin
Stellar coronagraphs designed for high-contrast imaging of exoplanets inevitably introduce a small amount of instrumental polarization, called \emph{secondary polarization}. At the…
astro-ph.IM2024
A Laboratory Method for Measuring the Cross-Polarization in High-Contrast Imaging
Richard A. Frazin
Existing Electric Field Conjugation (EFC) methods are not suited for treating small polarization effects, referred to here as cross polarization. EFC utilizes a deformable mirror (…