Optical Glass (N-BK7) Windows

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  • Regular price $65.00

Optical Glass or N-BK7 is the main choice for use in the VIS (400-700nm) range. This is ideal for protecting more expensive optical components and display systems. With excellent chemical and stain resistance, high index of refraction and high transmission this makes the N-BK7 a robust contender at a low price. 

Care must be taken as this material is temperature sensitive and not suitable for environments with extreme temperatures. A more robust, standard option in similar applications would be fused silica.

Firebird provides a number of stock options for Optical Glass but can provide customize and coated varieties suited to your exact specifications.


Optical Glass (N-BK7) Specs:

Wavelength range: 340-2,500nm Coating: Uncoated
Diameter tolerance: +/-0.1mm Surface Quality: 60/40
Thickness tolerance: ±0.2mm Paralellism: <3 arc minute
Clear Aperture: 90% Density: 2.51g/cm3
Melting point: 557ºC Young's Modulus: (GPa): 82
Coefficient of Thermal Expansion: 7.1x10/ºC Knoop Hardness:  610kg/mm2


N-BK7 Optical Glass