BK7 Windows

• Model: BK7 Windows
• Company: 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.