Andover Corporation

When light is incident between two dielectric media, part of the energy is reflected, thereby causing a decrease in transmission.
In modern, well-corrected optical systems

of many elements, this loss could be significantly high.

Even more undesirable is double-imaging or ghosting, and the deterioration of contrast caused by multiple reflections. If appropriate, thin-film coatings are deposited on all air-substrate interfaces, reflections can be effectively reduced, with a corresponding improvement in system performance.

Our capabilities in anti-reflection coatings range from single layers to multilayers, all characterized by their high efficiency, mechanical durability, and environmental stability. Although there are many different types of anti-reflection coatings, they generally fall into four basic categories:

These coatings can be designed for operation at angles of incidence other than normal, or optimized for a particular wavelength region. A detailed discussion of the sundry types of anti-reflection coatings available, and their applications, is not possible here. Several representative spectral curves are presented, indicative of our current capabilities. Our technical sales department would be pleased to respond to requests for further information or applications.