The BK7 window has good performance over visible and near IR spectrum for most application. The refractive index is 1.5168 at 587.6nm.
Specifications:
Dimension Tolerance:
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+0.0/-0.2mm
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Thickness Tolerance:
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±0.2mm（General),±0.05(High Precision)
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Surface Quality:
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60/40（General),10/5(High Precision)
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Clear Aperture:
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＞90%
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Flatness:
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λ/2@633nm（General),λ/10@633nm (High Precision)
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Parallelism:
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<3 arc min.(General). <3 arc sec.(High Precision)
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AR Coated:
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Uncoated, AR, HR, PR, etc.
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Typical Sizes:
Round Shape:Diameter(mm):
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Φ5.0；Φ10.0 ；Φ12.7；Φ15.0；Φ20.0； Φ25.4；Φ30.0；Φ38.1；Φ50.8；Φ76.2
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Square Shape:WxH(mm):
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5.0x5.0；10.0x10.0 ；15.0x15.0 ； 20.0x20.0；25.0x25.0；50.0x50.0
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Thickness Tolerance:
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0.5；1.0；1.5；2.0；3.0；4.0； 5.0；6.0；8.0；10.0; 50.0
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