Excellent optical performance: BK7 has a high optical transparency, especially suitable for the visible range, the transmittance is usually up to more than 90%.
Good mechanical properties: with high strength and toughness, suitable for precision optical components and equipment.
Low coefficient of thermal expansion: BK7 has a low coefficient of thermal expansion, which can maintain stable physical properties when the temperature changes.
High refractive index: It has a high refractive index (about 1.51), making it widely used in lenses and optical components.
Good workability: Precision cutting, polishing and coating can be performed for complex optical designs.
N-BK7 Product Introduction:
* Because of environmental protection requirements, BK7 as borosilicate glass has been discontinued, and the new alternative product is N-BK7.
N-BK7 is designed and produced by Schott, Germany, is widely used in a variety of visible light and short-wave infrared applications, compared to other similar glass, its advantages are mainly reflected in the following aspects:
High performance, low cost
Good consistency of materials
High uniformity of refractive index
Low stress birefringence
Less bubbles and stripes
-These aspects reflect the comparative advantage of German manufacturing
The Qualities of N-BK7
Optical materials is reflected in their uniformity. More specifically, the refractive index of the entire glass is extremely narrow. Therefore, optical glasses for high-power lasers and astronomical applications in particular require extremely high homogeneity.
N-BK7 can withstand lower transition temperatures, mostly below 550°C, which can increase mold life and shorten molding time.
There will be a low tendency for chemical reactions with mold materials within the molding temperature range.
Has strict optical tolerances.
Various glass sizes available.
A variety of supply forms, including optical raw materials, optical blanks, optical parts, etc.N-BK7
High-energy laser technology, measurement technology
Semiconductor industry
Satellite technology, imaging applications in astronomical applications
Absolute refractive index deviation is small: H5 glass has a peak-to-valley value of 1 x 10-6
The imaging resolution of this quality grade glass is extremely high
The product provides a separate test report
Uniformity is measured using an advanced and extremely accurate interferometer
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