P79909 Broadband Notch Filter
Double-pass notch filter delivering vivid violet (395 – 450 nm) and bright deep-red (700 – 740 nm) while plunging green-cyan light below 1 % for a pure magenta profile.
- Violet passband: 395 – 450 nm, > 90 % T
- Deep notch: < 1 % T 470 – 660 nm
(valley ≈ 0.2 % T) - Red passband: 700 – 740 nm, 92 – 94 % T
- Edge steepness: ~15 nm 90 → 10 % transitions
- 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
P79909 transmits two bright windows—one in the near-UV/violet and one in the deep red—while driving the entire
green-cyan band down to detector noise. Transmission exceeds 88 – 92 % from ~395 nm to 450 nm, drops
below one percent across ~470 nm – 660 nm, then rockets past 90 % near 700 nm and rides
92 – 94 % through ~740 nm before gently tapering. Rugged ion-assisted coatings shrug off heat,
humidity, solvents, and repeated cleaning. KUPO can coat Borofloat®, soda-lime, Schott D263 T, or Corning
Eagle XG substrates in any outline—from 5 mm chips to 450 mm plates, 0.21 – 3.8 mm thick—and ship
prototypes in about two weeks.
Typical uses: violet-excite/red-detect fluorescence, magenta stage lighting, UV + red machine-vision,
green-band suppression in Raman or multispectral sensors, and AR/HUD optics that need violet tracking plus red
graphics without mid-visible clutter.
Description
P79909 transmits two bright windows—one in the near-UV/violet and one in the deep-red—while it drives almost the entire green-cyan band to detector noise. Transmission sits above 88–92 % from about 395 nm to 450 nm, then falls below 1 % across roughly 470 nm – 660 nm. It rockets past 90 % again near 700 nm, holds 92–94 % through ~740 nm, and gently tapers toward 780 nm. The spectrum is perfect whenever you want vivid magenta light or need violet excitation with red detection, minus the mid-visible clutter.
Key advantages
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Deep 470 – 660 nm notch – < 1 % T chops green autofluorescence and ambient spill.
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High dual passbands – > 90 % T in 395 – 450 nm and 700 – 740 nm keeps violet sources and red detectors bright.
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Broad blocking floor – Mid-band floor down to ~0.2 % boosts signal-to-noise in sensitive imaging.
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Hard-oxide durability – Ion-assisted coating endures heat, humidity, solvents, and frequent cleaning.
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Custom formats – Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21 – 3.8 mm, 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 cleaner contrast.
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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 – Create 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? P79909 filters can be coated, diced, and shipped to your exact specifications—fast.
