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BK7 Windows
About Avantier Inc.- Type: Windows
- Applications: Astronomy, Biomedical/Medical, Communications, Industrial, Military, Scientific Research
- Irregularity (fringe): l/10
- Diameter Tolerance: +0.0, -0.05mm
- Thickness Tolerance: +/- 0.1mm
- Clear Aperture (%): C>85%
- Parallelism: 1 arcmin
- Surface Quality: 10-5
Avantier’s BK7 windows are ideally suited for rigorous optical applications, attainable with laser-grade precision. BK7 glass boasts a density of 2.51 g/cm³ and a Knoop hardness rating of 610. Its coefficient of thermal expansion measures approximately 7.1 x 10^-6 K in the range from -30 °C to +70 °C, and about 8.3 x 10^-6/K from +20 °C to +300 °C.
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