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BK7 Window
N-BK7(Chinese Equivalent H-K9L),a relatively hard galss,does not scratch easily and can be handled without special precautions.N-BK7 performs well in chemical tests such that special treatment during polishing is not necessary.The bubble and inclusion content of N-BK7 is less than 0.029mm2 per 100 cm3.N-BK7 has excellent transmittance as low as 350nm.
Grade E H S
Material N-BK7
Diameter Tolerance +0.0, -0.1mm
Thinkness Tolerance ±0.1mm ±0.2mm
Clear Aperture >90%
Parallelism 5" 10" 30"
Wavefront Distortion(@632.8nm) λ/10 λ/8 λ/4
Surface Quality 10/5 20/10 60/40
Bevel Protective
Coating Uncoated
P/NΦTGrade
1010110.006.00E
1010212.706.00E
1010315.006.00E
1010420.006.00E
1010525.406.00E
1010610.006.00H
1010712.706.00H
1010815.006.00H
1010920.006.00H
1011025.406.00H
1011110.003.00S
1011212.703.00S
1011325.403.00S
1011438.003.00S
1011550.003.00S
●Unit:mm
●Other sizes and coatings are available upon request.