N-BK7 Windows

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.

Note for N-BK7 Window:

Attribute	Specification
Typical Diameter (Φmm)	10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 38.1, 50.8
Typical Thickness (mm)	2.0, 3.0, 6.0, 6.35
Diameter Tolerance (mm)	+0.0/-0.2 (General), +0.0/-0.02 (High Precision)
Thickness Tolerance (mm)	±0.2 (General), ±0.005 (High Precision)
Clear Aperture	>80% (Small Size), >95% (Large Size)
Parallelism	3 min. (General), 3 sec. (High Precision)
Surface Quality	60/40 (General), 10/5 (High Precision)
Flatness (per 25mm@633nm)	λ /2(General), λ/20 (High Precision)
Bevel (face width x 45^。)	<0.25mm
Coating	Uncoated, AR, HR, PR, Coating, etc.

Fused Silica Windows

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Note for N-BK7 Window:

Note for N-BK7 Window: