Optical coatings are thin layers of materials applied to optical components such as lenses, mirrors and filters. Their primary purpose is to enhance the performance of optical components by alternating how light is reflected, absorbed or transmitted. They provide image clarity, minimize glare, and increase light throughput in complex optical systems.

In addition, optical coatings are applied to optics to improve environmental durability and to modify physical and electrical properties of the components.

Precise deposition techniques such as physical vapor deposition (PVD) or chemical vapor deposition (CVD) are used to create thin film coatings. They require specialized coating systems, fixturing, and processes to ensure uniformity and adherence to specifications.

Optical coatings are indispensable in aerospace and defense applications, ensuring high-efficiency performance and long-term reliability for mission-critical systems, including targeting optics, sensors, and displays. Design considerations include durability required to meet extreme environmental conditions, moisture and abrasion.

How Optical Coatings Work

Common types of coatings are anti-reflective coatings, which minimize specular and diffuse reflections and maximize light throughput. Reflective coatings, which are created via dielectric or metallic depositions, are used to enhance mirror performance, as well as to block or reflect specific wavelengths.

Protective coatings such as diamond-like coatings (DLC) are used to improve surface durability and protect against abrasion and chemicals. For EMI shielding purposes, conductive coatings, such as Indium Tin Oxide (ITO) and metallic alloys, are used. Selecting the right coating and substrate depends on a variety of factors, such as performance criteria, the transmitted and reflected wavelengths, angle of incidence, cost, and range of environmental exposure.

Costs are determined by the coating complexity, the number of layers, deposition materials, methods, and substrate type. Qualification, assembly, and testing of high-performance optics also impact the overall production costs.

Applications of Optical Coatings

Optical coatings, such as AR and NVIS coatings play a critical role in the performance and reliability of mission-critical equipment, improving sunlight readability of display systems used in high ambient light environments and providing visual clarity in imaging, sensor and night vision systems used in low light environments.

Additionally, near infrared (NIR) band pass coatings are used to optimize laser targeting systems and thermal sensor equipment. Conductive coatings are used to provide EMI/RFI shielding of electronics such as LCD displays from electromagnetic interference, and for transparent heating of LCD and optics used in cold environments.

Coatings are used in aerospace systems to increase the physical and thermal durability and optical performance of components used in satellite imaging and avionics. These coatings protect components against extreme temperatures, radiation and debris in space-based environments, ensuring reliability and accuracy.

Cevians’ Optical Coatings

As a leader in thin film coated optics including anti reflective, conductive, band pass, band rejection, and full color NVIS coatings, Cevians custom optical coatings are engineered to meet the demanding requirements of aerospace and defense applications. With extensive expertise in thin films, precision deposition, and component integration, Cevians delivers tailored solutions that optimize performance for mission-critical systems. 

View Cevians optical products to learn more.