A-Star’s N-BK7 glass
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The BK7 window has good performance over visible and near IR spectrum for most application.
N-BK7 glass is the arsenic- and lead-free successor material of BK7, which has been discontinued. It is one of the most common technical optical glass materials, used for numerous high quality optics like optical windows, substrates and lenses in the visible range. N-BK7 is a relatively tough bor-crown glass and shows a good scratch resistance. N-BK7 glass has a very low amount of inclusions and is almost free of bubbles. Another reason why N-BK7 material is often used for light transmitting optics, is the high linear optical transmission of the glass in the visible range down to N-BK7 polished glass window optics350 nm. Because of stable chemical properties of N-BK7 glass Windows, no special treatment is required to grind and polish the material. N-BK7 raw glass is produced in strips and blocks up to about 350 mm wide and about 70 mm thick. It can be fabricated to any smaller size. Larger N–BK7 strip materials and bigger dimensions are available on request. We grind, polish and shape this precision glass according to customer’s specifications.
Windows are widely used on optical system. There can be extreme differences of temperature, pressure, humidity and other parameters on either side of the window. The optical, mechanical and thermal properties of windows must be considered according to the intended use.
We offer a range of optical quality windows including BK7 windows, Fused Silica windows,calcium fluoride (caf2) windows,Optical Windows Sapphire.