Rocky Mountain Instrument Co.

Optical Coatings:

Developed in conjunction with

Anti Reflection (AR) » Single Layer AR


400 nm ≤ λ ≤ 2.0 µm

Single-Layer Magnesium Fluoride (MgF2) is the most common anti-reflection coating. It is a hard, durable coating that reduces surface reflectance of BK7 from approximately 4% to less than 1.3% at the specified center wavelength and normal incidence.

Reflection losses for higher index materials such as sapphire are less than 0.5%. This coating is widely used in commercial optical products and other less demanding applications.


RMI Standard Specifications
Angle of Incidence: 0º or 45º
Reflectance: Unpolarized
R ≤ 1.3% at 0º
R ≤ 2.0% at 45º
R ≤ 0.5% at 0º
R ≤ 1.0% at 45º