Silicon is a widely used optical material notable for its unique properties, including high thermal conductivity, low thermal expansion, and excellent infrared transmission. These attributes make it an ideal candidate for a variety of advanced optical applications, such as infrared lenses and mirrors in spectroscopy, thermal imaging, and semiconductor lithography. We offer high-quality silicon components, available both uncoated and with anti-reflective coatings tailored for the 3-5 micron band, to enhance performance in critical infrared applications.