An Optical Window is a transparent optical component that transmits light while acting as a barrier between the detrimental external conditional and sensitive cores inside a system. Apart from the primary function of protection, optical windows might also be used as elements to increase transmission, enhance contrast, or seal a hermetic chamber. Optical windows can be incorporated into a diverse range of optical devices including sensors, cameras, and lasers.

N-BK7 is a kind of optical glass often used for manufacturing optical components, including windows. N-BK7 glass is known for its low cost, high optical transmission across the visible spectrum and into the near-infrared region, low dispersion, high hardness and resistance to scratches and abrasions, and the ability to withstand changes in temperature without significant expansion or contraction. It belongs to the Schott glass catalog, and is one of the most common optical glass materials.

North Optics offers stock and custom λ/4 N-BK7 Windows with multiple coating options: uncoated, 400-700nm, 700-1100nm, 1100-1650nm, or customizable coatings. Regarding the off-the-shelf products, sizes are standardized which benefits OEM, whilst a maximum diameter of 300mm is procurable in custom versions. These N-BK7 windows, featuring an exceptional surface quality of 10/5 S/D accredited to our tight-geometric control measures, optical excellence and robustness are competent at various tasks.