A Physics-Based Approach to Solving the Near Angle Scatter Dilemma (FRTS)

We propose a new physics based scatter model, which has the ability to predict Near Angle Scatter phenomena - mission critical for future flagship missions such as the Habitable Worlds Observatory (HWO) for seeing exoplanets. We intend to implement a software test-bench to compare measured Bidirectional Reflectance Distribution Function (BRDF) from the Solar UltraViolet Imager (SUVI) telescope to predicted results from the model. Additionally we will extend the proposed model to include higher order effects, such as secondary scatter. This new model has the ability to model any scattering surface and is derivated from first principles, and thus important for modeling Extreme UltraViolet (EUV) lithography optics and extremely smooth optics.