MgF2 – One of the most commonly used antireflection coatings, a quarterwave optical thickness layer of Magnesium Fluoride can act as a highly durable coating when deposited under appropriate conditions. The minimum reflectance achieved depends on the substrate index. This makes MgF2 attractive as an AR coating for imaging systems where the lenses are often of high index, and the incident angles on the lens are high.
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Single Wavelength AR Coating (V-coat) – For more narrowband AR performance, such as in laser-based systems, the V-coat is an appropriate choice. The wavelength of minimum reflectance may be chosen for any wavelength in from the ultra-violet to the infrared, and typical performance is <0.1% reflectance at the target wavelength.
Metallic coatings exhibit high reflectance over broad wavelength ranges. Aluminum is the most common, and may be deposited with a hard and transparent dielectric protective layer to increase durability. Alternatively, multiple dielectric materials may be added to Aluminum to increase its reflectance over a desired wavelength range. Aluminum has high reflectance from the deep UV to the infrared.
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Gold is a commonly used infrared mirror due to its flat reflectance curve from approximately 600nm to well into the infrared. Gold mirrors may be deposited bare for infrared applications, or with protective or reflection enhancing layers to suit the particular application. Silver is a high reflector from at least 400nm out to the infrared. As with most metals, Silver may be deposited with protective or reflection enhancing layers to suit the particular application.Dielectric High Reflectors – Dielectric high reflectors, sometimes referred to as dichroics, can be designed with custom blocking and transmission ranges to suit a variety of applications. Custom specifications are possible upon request.
Beamsplitter – Beamsplitters can be designed to be used in ambient air, or immersed inside a prism. Custom wavelength ranges from the visible to the infrared and nearly any ratio of reflection to transmission can be designed for. Additionally, filmstacks for meeting polarization requirements can be designed.
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