N-BK7 Windows
This kind of windows is made from SCHOTT N-BK7 Glass, which has transparent range from 330-2100nm. The BK7 window has good performance over visible and near IR spectrum for most application. The refractive index is 1.5168 at 587.6nm.
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Attribute
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Specification
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Material
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N-BK7
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Typical Diameter (Φmm)
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8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8
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Typical Thickness (mm)
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1.0, 2.0, 3.0, 4.0, 6.35
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Diameter Tolerance (mm)
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+0.0/-0.2 (General), +0.0/-0.02 (High Precision)
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Thickness Tolerance (mm)
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±0.2 (General), ±0.005 (High Precision)
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Clear Aperture
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>80% (Small Size), >95% (Large Size)
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Parallelism
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3 min. (General), 3 sec. (High Precision)
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Surface Quality
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60/40 (General), 10/5 (High Precision)
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Flatness (per 25mm@633nm)
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λ/4(General), λ/10 (High Precision)
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Bevel (face width x 45°)
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<0.25mm</div>
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Coating
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Uncoated, AR, HR, PR Coating, etc.
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Note for N-BK7 Windows:
(1). Custom-made windows at any size are available.Besides round, windows 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). Windows with Anti-Reflective(AR), High-Reflective(HR), Partial-Reflective(PR) coating are available.
Contact : amiee ye,
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