This category presents case studies on silicon carbide (SiC) optics, showing how Avantier engineers ultra-lightweight, thermally stable mirrors for demanding aerospace and space applications. Highlighted projects include large-aperture primary mirrors that achieve surface densities ≤ 40 kg/m² and up to 90% weight reduction using reaction-bonded SiC, setting new benchmarks for lightweight space optics while preserving stiffness and thermal performance. Another case describes optimizing SiC mirrors for deep-space missions, where extreme temperature variations and mechanical loads require exceptional stability, surface accuracy, and coating durability. Each case study explains why SiC was selected over alternatives such as beryllium, how AI-driven design tools and advanced metrology guided lightweighting strategies, and how manufacturing and polishing processes were tuned to meet tight specifications. These real-world examples help system designers, optical engineers, and mission planners understand how SiC mirrors can improve payload efficiency, imaging quality, and reliability. The category also illustrates Avantier’s ability to support projects from early concept through final qualification for high-stakes aerospace and astronomy programs.