Infrared (IR) windows are essential in various industries, including aerospace, defense, healthcare, and thermal imaging. Common materials like germanium, zinc selenide, sapphire, silicon, and calcium fluoride are selected based on their transmission range and durability. Anti-reflective (AR) coatings and metallization improve the transmittance and functionality of these windows. Innovations like synthetic diamond coatings and adaptive IR windows are pushing the boundaries of the technology. GEM Optics Group LLC, a leading producer, has specialized in high-volume, advanced IR windows for many years, supplying industries with custom solutions for cutting-edge applications.