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BK7 Glass

Optics >>> Optical Material >>> BK7

BK7 is a borosilicate crown optical glass with high homogeneity, low bubble and inclusion content. Its good physical and chemical properties make it widely used in visible and near IR range. Most of windows, lenses and prisms, which used in laser, optical system, optical communication, are made from BK7 glass. 

BK7 Properties:

  • Transmission range: 330 nm~2100 nm
  • Thermal Expansion Coefficient: 7.5X10-6 /K
  • Density: 2.51 g/cm3

Transmission curve:    



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