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BK7 Windows
About Shanghai Optics Inc.- Type: Windows
- Applications: Biomedical/Medical, Industrial, Scientific Research
- Irregularity (fringe): l/10
- Diameter Tolerance: +0.0, -0.05mm
- Thickness Tolerance: ±0.1mm
- Clear Aperture: >85%
- Surface Quality: 10-5 scratch and dig
- Wavefront Distortion: l/10 per 25mm
Shanghai Optics' BK7 windows are suitable for demanding optical applications and can be manufactured with laser-grade precision. BK7 glass has a density of 2.51 g/cm3 and a Knoop hardness of 610. It has coefficient of expansion of about 7.1 x 10-6 K from -30 °C to +70 °C, and about 8.3 x10-6/K from +20 °C to +300 °C.
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