Bk7 Optical Glass Window

BK7 Windows is used to produce both optical windows and optical mirrors. BK7 is an optical glass with excellent physical and chemical properties for applications in visible and near IR. BK7 glass has high homogeneity, low bubble, and inclusion content can be produced at a large quantity and low cost, making it the standard material for optical components both as uncoated or coated in visible and IR. This Optical glass window is the most common type of window because it has good performance over visible and near-infrared wavelength regions. BK7 window is ideal for applications that require minimal transmitted beam deviation. With all these excellent features, the BK7 window is widely used in projection optics systems, imaging, optical measurement system, and many other applications. This barium borosilicate glass is known for its high transmission and clean, clear appearance. It is by far the most common material for many optical glass applications because it offers good optical properties and a reasonable price. It’s used often as a standard of comparison for other glass materials. It is most often selected due to its relatively low cost, a high index of refraction of 1.51680 at 587 nm wavelength, yellow helium line, and high transmission rate. Bk7 optical glass windows have an excellent < 30 arc-seconds parallelism resulting in minimal transmitted beam deviation. The windows are available with broadband AR coatings on both sides for use in visible or IR applications. BK7 is a crystalline material used in optical window applications because of its properties like its clear, uniform color, it is free of bubbles and inclusions, and gives a high degree of purity and homogeneity. It also gives an excellent chemical and stain resistance property, provides superior transmission in the VIS to NIR spectrum, and has a Low absorption and uniform transmission in the visible spectrum. Choosing a BK7 glass window comes with so many benefits but some factors need to be taken into consideration before making this choice because this glass is very sensitive to temperature which makes it difficult to use in an environment where it can be exposed to thermal shock. Instead of the use of fused silica window or when additional benefits of fused silica are not gotten, BK7 Optical glass is used, since BK7 performs well in all chemical tests, and no additional or special handling is required, costs of manufacturing are reduced. It is a relatively hard material with extremely low bubble and inclusion content while providing excellent transmittance throughout the visible and near-infrared spectra. Not just into Bk7 Optical Glass windows, Alpine research optics also is a convex vs concave lens company and also into optical laser optics.

Why Bk7 Optical Glass Windows Are Used

It has good resistance against chemical and stain
Superior transmission in the VIS to NIR spectrum
Low absorption and uniform transmission in the visible spectrum
When mounted, they have a clear and uniform color
It is almost free of bubbles and inclusions
A high degree of purity and homogeneity
Due to its excellent performance, but its gap between plasticity and hardness is huge, making traditional machining easy to appear sub-surface
The surface quality and processing efficiency of BK7 optical glass are improved by longitudinal torsional composite ultrasonic vibration milling and the optimal process parameters for BK7 optical glass longitudinal torsional ultrasonic milling

Application Of Bk7 Optical Glass Window

BK7 optical glass has been widely used in modern high-tech fields such as aerospace
It is used for automotive, optical precision instruments.
It is used in electronic information.