BK7 Windows
BK7 window is the most common type of window. It has good performance over visible and near infrared wavelength region. At the same time,BK7 window is ideal for applications require minimal transmitted beam deviation. It is suitable for AR coating .

Material: BK7 grade A optical glass
Bevel:  <0.25mm X 45°
Coating: Optional (Uncoated, AR, HR, PR, Coating, etc.)
  Standard High Precision
Dimension Tolerance +0.0/-0.2 +0.0/-0.02
Thickness Tolerance ±0.2 ±0.005
Surface quality: 60-40 10-5
Clear Aperture >85% >95%
Flatness(per 25mm@633nm) λ /2 λ /10
Parallelism 3 min 3 sec
Standard BK7 Window
Round Shape:
Φ10x3  Φ12.7x3  Φ15x1  Φ15x3  Φ20x3 Φ25x3  Φ25.4x3  Φ30x3  Φ50x3  Φ50.8x6.35 
Square Shape:
5x5x1  10x10x1  15x15x2  20x20x2  25x25x2  50x50x6
High Precision BK7 Window
Φ10x6  Φ12.7x6  Φ25x6  Φ25.4x6.35  Φ30x6  Φ50x10
Note for N-BK7 Window:
(1). Custom-made N-BK7 windows at any size from Φ2.0mm to Φ350mm clear aperture are available.
Besides round, N-Bk7windows at shape of quadrate, triangular, or other polygonal are available.
(2). Thickness from 1.0mm to 50.0 mm is available upon request.
(3). 100% clear aperture is available upon request.
(4). Better bevel is available upon request.
(5). N-BK7 Windows with Anti-Reflective(AR), High-Reflective(HR), Partial-Reflective(PR) coating are available.

Ms. Lin

Mr. Wen