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Infrared (IR) Equilateral Prisms are available in three substrate options. Calcium Fluoride is a low index (1.434) material with excellent transmission from 0.19 - 7μm, making it ideal for applications throughout the UV, Visible, and Infrared spectra. Germanium is a dense material with a high index (n10.6μm = 4.0034), making it ideal for applications from 3 - 12μm where the optical path length needs to be maximized. Zinc Selenide (n10.6μm = 2.4028) is commonly used with CO2 laser applications, and features high transmission from 1 - 16μm.
Equilateral prisms feature three equal 60° angles and are often referred to as dispersing prisms. Equilateral prisms are ideal for wavelength separating applications. Incoming light is refracted twice while passing through the prisms. Total beam deviation, and wavelength separation, is dependent on the material’s refractive index.
Note: Special care should be taken when handling Zinc Selenide as it is a toxic material. Always wear rubber or plastic gloves to avoid risk of contamination.