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TECHSPEC® λ/4 N-BK7 Precision Windows are ideally suited for industrial and low power laser applications. The high tolerance design yields minimal beam distortion and scatter. Broadband coating options extend the range of these precision windows through the visible and near-infrared spectra.
Note: New additions to this product family may be specified with a transmitted wavefront distortion (TWD) specification instead of a surface flatness. For more information on the difference between these two specifications, see our application note on Understanding Optical Windows.
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Typical transmission of a 3mm thick, uncoated N-BK7 window across the UV - NIR spectra. |
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Typical transmission of a 3mm thick N-BK7 window with MgF2 (400-700nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg ≤ 1.75% @ 400 - 700nm (N-BK7) Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with VIS-EXT (350-700nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg ≤ 0.5% @ 350 - 700nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with VIS-NIR (400-1000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Rabs ≤ 0.25% @ 880nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with VIS 0° (425-675nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg ≤ 0.4% @ 425 - 675nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with YAG-BBAR (500-1100nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Rabs ≤ 0.25% @ 532nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with NIR I (600 - 1050nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg ≤ 0.5% @ 600 - 1050nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick N-BK7 window with NIR II (750 - 1550nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Rabs ≤ 1.5% @ 750 - 800nm Data outside this range is not guaranteed and is for reference only. |
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