Available from Infrared Optical Products, the 40-page catalog “Optical Products for the InfraRed” details lens systems, infrared filters, spherical and cylindrical lenses, circular and Brewster windows, plano and concave partial reflectors, hemispherical and hyperhemispherical domes, and laser beam expanders and condensers. The devices are itemized by diameter, effective focal length, back focal length and other categories. The products are made of materials such as silicon, germanium, Cleartran, zinc sulfide, zinc selenide and barium fluoride. An introductory section covers transmission curves and physical and optical properties of materials. Charts are provided.