BH-N17 Broadband Notch Filter
Double-pass notch filter passing vivid violet (400 – 470 nm) and bright red (595 – 740 nm) while plunging green-cyan light below 1 % for a crisp magenta spectrum.
- Violet passband: > 90 % T @ 400 – 470 nm
- Deep notch: < 1 % T @ 514 – 538 nm
- Red passband: 595 – 740 nm, 92 – 95 % T
- IR roll-off: Gentle decline beyond ~740 nm limits stray IR
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Ripple smoothing, AOI tuning, rapid prototypes
Learn more
BH-N17 transmits two clean windows—one in the violet–blue range
(≈ 400 – 470 nm) and one in the visible red (≈ 595 – 740 nm)—while forcing the
green-cyan region down to detector noise. Transmission sits above 88 – 93 %
through the violet window, drops below one percent from ~514 nm to 538 nm,
then rockets past 90 % again near 595 nm and rides 92 – 95 % out to about
740 nm before tapering smoothly toward the near-IR.
KUPO coats Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates
cut to any outline—from 5 mm chips to 450 mm plates—with thicknesses
of 0.21 – 3.8 mm, and can ship prototypes in roughly two weeks.
Typical uses: violet-excite/red-detect fluorescence, magenta stage
lighting, UV + red machine-vision illumination, green-band suppression in Raman
or multispectral sensors, and AR/HUD optics that need violet tracking plus red
graphics without mid-visible clutter.
Description
BH-N17 transmits two clean windows—one in the violet–blue (≈ 400 – 470 nm) and one in the red (≈ 595 – 740 nm)—while plunging nearly all green-cyan light to instrument noise. In the notch region, transmission stays below 1 % from roughly 514 nm to 538 nm, then rockets back past 90 % by about 595 nm. Ripple in both passbands is held to ±2–3 %, and the spectrum tapers only gently beyond ~740 nm, limiting stray near-IR. The result is a vivid magenta channel with mid-visible clutter neatly excised.
Key advantages
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Deep 480 – 570 nm notch – suppresses green autofluorescence and ambient glare.
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High dual passbands – > 90 % T in 400 – 470 nm and 595 – 740 nm keeps violet excitation and red detection bright.
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Stable red plateau – Flat 92 – 95 % out to ~740 nm maintains colour balance and signal strength.
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Hard-oxide durability – Ion-assisted layers shrug off heat, humidity, solvents, and repeated cleaning.
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Flexible formats – Round, square, or complex blanks from 5 mm to 450 mm, 0.21 – 3.8 mm thick, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG glass.
Typical applications
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Fluorescence microscopy & cytometry – Pass violet excitation and red emission while muting green background for sharper images.
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Raman & multispectral sensors – Block 532 nm / 561 nm laser lines yet keep violet and red Stokes or anti-Stokes bands.
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Stage & architectural lighting – Produce saturated magenta washes (violet + red) with negligible green spill.
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Machine-vision systems – Combine UV flaw detection with red contour lighting, eliminating mid-band reflections.
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AR / HUD optics – Inject violet tracking beams and red graphics while keeping the central visible band dark to the eye.
Need prototypes fast or production volumes soon? BH-N17 filters can be coated, diced, and shipped to your exact specifications—quickly.
