Assessment of an Active Optics system based on Phase Diversity and a Spatial Light Modulator for a Solar Space Instrument

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Phase Diversity (PD) is an active optical post-processing technique used to correct thermo-optical aberrations in solar space instruments. By comparing images acquired at nominal focus with images featuring a known defocus, the system reconstructs wavefront errors using Zernike coefficients. This effective restoration methodology allows for high-precision spectropolarimetric observations by compensating for structural deformations in the telescope optics after flight deployment.