BH-N19 Broadband Notch Filter
Double-pass notch filter passing vivid violet (400 – 460 nm) and deep red (625 – 760 nm) while plunging green-cyan light below 1 % for a crisp magenta spectrum.
- Violet passband: > 90 % T @ 400 – 460 nm
- Deep notch: < 1 % T @ 472 – 595 nm
- Red passband: 625 – 760 nm, 92 – 94 % T
- Red plateau: Ripple ≤ ±2 % keeps colour flat
- 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-N19 transmits two clean windows—one in the violet–blue band
(≈ 400 – 460 nm) and one in the visible- to deep-red region (≈ 625 – 760 nm)—while
forcing the green–cyan zone down to detector noise. Transmission tops 90 – 93 %
across each passband, drops below one percent from ~472 nm to 595 nm, then vaults
back above 90 % near 625 nm and remains flat to the end of the measured range.
KUPO coats Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates in
any outline—from 5 mm chips to 450 mm plates—with thicknesses of
0.21 – 3.8 mm, and can ship prototypes in about 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 needing violet tracking plus red graphics without
mid-visible clutter.
Description
BH-N19 passes two clean windows—one in the violet–blue (about 400 – 460 nm) and one in the visible-red through deep-red (roughly 625 – 760 nm)—while it drives the entire green–cyan band to detector noise. Transmission tops 90 – 93 % across each passband, drops below 1 % from approximately 472 nm to 595 nm, then vaults back over 90 % by ∼625 nm and stays flat to the end of the measured range. The result is vivid magenta throughput with mid-visible clutter cleanly suppressed.
Key advantages
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Deep 472 – 595 nm notch – < 1 % T scrubs green autofluorescence and ambient glare.
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High dual passbands – > 90 % T in 400 – 460 nm and 625 – 760 nm keeps violet excitation and red detection bright.
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Flat red plateau – Ripple held to ±2 % ensures uniform colour and signal strength.
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Hard-oxide durability – Ion-assisted coating withstands heat, humidity, solvents, and repeated cleaning.
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Custom formats – Round, square, or free-form 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 & flow cytometry – Pass violet excitation and red emission while silencing green background for higher contrast.
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Raman & multispectral sensors – Block 532 / 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 in days or production volumes next quarter? BH-N19 filters can be coated, diced, and shipped to match your exact specifications—fast.
