Optical Windows Selection Guide

An Optical Window is an optically flat, transparent optical material that allows light into an instrument. Newport offers a wide variety of optical windows made from materials like N-BK7, Fused Silica, Sapphire, Germanium, Zinc Selenide, Calcium Fluoride, and Magnesium Fluoride. Parallel or wedged optical windows can be purchased with laser grade surface quality and surface flatness for common or very demanding interferometer measurements. Newport also offers anti reflection coated optical windows to improve the transmission from UV to IR wavelength regime.

Browse all Optical Windows to review our standard models, or select a product series below for more information on our products and capabilities.

Standard Optical Windows

	Optical Windows	Features
	Parallel Windows	Parallel to less than 30 arc sec for minimal transmitted beam deviation ≤Λ/20 surface flatness and 10-5 scratch-dig High quality N-BK7 or UV grade fused silica Available in 12 sizes from 5.0 mm to 50.0 mm diameter Broadband AR coatings for UV, visible, or NIR applications
	High-Energy Laser Wedged Windows	Damage resistant up to 10 J/cm² UV fused silica for excellent thermal stability Low wavefront distortion Hard refractory coatings 25.4 and 50.8 mm diameters
	Sapphire Optical Windows	High transmittance from 150 nm to 5 µm Extremely hard and durable material Ideal for thermally demanding environments 1/2, 1, and 2 inch diameter
	Germanium Optical Windows	Minimize chromatic aberration due to low dispersion Anti-reflection coated for 3 µm to 12 µm or 8 µm to 12 µm Available in 7 sizes from 10.0 mm to 75.0 mm diameter Ideal for IR applications
	Zinc Selenide Optical Windows	High transmission (>90%) from 3 µm to 12 µm Low dispersion and low absorption coefficient Ideal for thermally demanding environments Available in 8 different sizes from 10.0 mm to 75.0 mm diameter
	Calcium Fluoride Optical Windows	High average transmittance Low chromatic aberrations Ideal for UV to NIR applications (180 nm to 8 µm) Available in 9 sizes from 5.0 mm to 50.0 mm diameter
	Magnesium Fluoride Optical Windows	High transmittance from 0.15µ m to 6.5 µm High resistance to thermal and mechanical shock Ideal for deep UV to infrared regions Available in 4 sizes from 5.0 mm to 50.0 mm diameter

Specialty Optical Windows

	Optical Windows	Features
	Interferometer Flats	UV fused silica for excellent thermal stability Λ/10 surface flatness and 10-5 scratch-dig Slight wedge virtually eliminates internal fringes Interferogram included
	Shear Plate Collimation Tester	For quick, easy testing of beam collimation Useable in the visible wavelength range Fused Silica Material 2" diameter size
	Brewster Windows	Ideal for Laser Cavities Reduction in loss of P-Polarized Light 10-5 Scratch-Dig Limit transmitted wavefront distortion to Λ/10