BK7 optical window

flat circular

Glass Windows, Circular * High quality optical glass * Economical * Suitable for Anti-Reflection coating These superior glass windows are made from the best quality BK7. This material is very homogeneous and free from internal defects. The windows are precision polished on both surfaces and held parallel to ≤3arcmin. λ/10 transmitted wavefront distortion is usually preferred but λ/4 is offered as an option when this is not an issue. Anti-Reflection coatings can be applied to these windows for a small additional cost.