Optical Glass (N-BK7 types)
The default optical crown glass. Tight refractive index homogeneity and clean transmission through the visible and near-infrared, for lenses, prisms, and standard windows.
Flat optics material
Typical properties
- Transmission range
- 0.35 – 2.0 µm
- Refractive index
- 1.5168 (nd)
- Knoop hardness
- 610 kg/mm²
- Density
- 2.51 g/cm³
- Thermal expansion (CTE)
- 7.1 × 10⁻⁶ /K
Published values for this material class, given to help you shortlist a substrate. They are not lot-specific guarantees. Request the SPEKTON datasheet for certified figures against your specification.
Download Technical Datasheet (PDF)Datasheet referenced from Crystran.
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