Meller Optics Inc. is offering IR and broadband windows and lenses fabricated from zinc selenide and sulfide, germanium, silicon, and calcium and magnesium fluoride. The optics, which provide transmission up to 20 µm, are offered in planoconvex and -concave, and meniscus configurations with λ/4 and λ/10 surfaces. They can be supplied with antireflection coatings and have diameters ranging from 0.25 to 5 in. with ±0.005-in. tolerances; thickness tolerances are ±0.002 in. Applications include laser optics and IR detector packaging.