Cleveland Crystals Inc. deposits solgel antireflective coatings on large-scale windows, prisms and lenses up to 0.8 m in diameter, and on optics up to 1 m in diameter. The passband can be centered within 10 nm across the clear aperture. These broadband coatings offer reflective losses <1% per surface across hundreds of nanometers, reducing the stack-up losses that are associated with uncoated multielement assemblies. The coatings are removable and do not require repolishing the substrate. The company says this coating process is a low-risk alternative to conventional vacuum-based multilayer dielectric coatings.