Optical window
Knight Optical

These precision grade BK7 windows can be used to seal optical enclosures. Our stock range of ¼ wave BK7 windows are uncoated and also AR coated both faces with BBAR for visible and NIR applications (450-900nm) Our stock BK7 windows can also be AR coated for other wavelengths, Beamsplitter coated or mirror coated to meet your bespoke custom requirements.

These BK7 windows have parallel faces so will introduce minimal beam deviation. Flatness and surface quality is tightly controlled. Stock BK7 plates can be edged down to smaller diameters and custom sizes at short notice, please speak to our sales team.

Specifications:
Material: BK7
Diameter: +0, -0.15mm
Length, width: ±0.1mm
Thickness: ±0.1mm
Flatness/Both Faces: λ/4 over 90% of aperture dimensions
Surface Quality: <40-20 scratch/dig
Parallelism: <30 arcsec