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Flat Windows

Thorlabs offers flat windows fabricated from N-BK7, UV Fused Silica (UVFS), Sapphire, Calcium Fluoride, Magnesium Fluoride, Potassium Bromide, Infrasil, Zinc Selenide, Silicon, Germanium, Barium Fluoride, or Polycrystalline CVD Diamond. Our catalog includes UVFS or Infrasil textured windows featuring a nanostructured surface, which achieve a low average reflectance of <0.25% per surface over a broad wavelength range from 400 - 1100 nm or 1 - 1.7 µm, respectively. Our laser windows have a wavelength-specific AR coating centered around commonly used laser wavelengths and an optional wedge, while our precision windows are offered with or without a broadband AR coating. For more information on these substrates, please visit our Optical Substrates page.