M79508 Broadband Notch Filter
Double-pass notch filter passing vivid violet (395 – 445 nm) and rich red (630 – 750 nm) while plunging green-cyan light below 1 % for a pure magenta spectrum.
- Violet passband: 395 – 445 nm, > 90 % T
- Deep notch: < 1 % T 470 – 600 nm
(valley ≈ 0.2 % T) - Red passband: 630 – 750 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
M79508 transmits two bright windows—near-UV/violet (≈ 395 – 445 nm) and deep red (≈ 630 – 750 nm)—while driving
the entire green–cyan band to detector noise. Transmission climbs above 90 % from ~395 nm to 445 nm, drops below
one percent across 470 nm – 600 nm, then rockets past 90 % near 630 nm and rides a 92 – 94 % plateau out beyond
750 nm. Ion-assisted hard-oxide coatings survive heat, humidity, solvents, and repeated cleaning. KUPO can coat
Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG glass 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 needing violet tracking plus red
graphics without mid-visible clutter.
Description
M79508 passes two bright windows—one in the near-UV/violet band and another in the deep-red—while it drives almost the entire green-cyan region down to detector noise. Transmission climbs above 90 % from roughly 395 nm to 445 nm, then plunges below 1 % across about 470 nm – 600 nm. It rockets past 90 % again near 630 nm and rides a 92 – 94 % plateau out beyond 750 nm before gently tapering. The result is a vivid magenta spectrum that keeps violet excitation and red emission (or violet + red lighting) bright yet eliminates mid-visible clutter.
Key advantages
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Deep 470 – 600 nm notch – < 1 % T cuts green autofluorescence and ambient glare.
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High dual passbands – > 90 % T in 395 – 445 nm and 630 – 750 nm maximises violet sources and red detectors.
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Broad blocking floor – Mid-band floor down to ~0.2 % boosts signal-to-noise for sensitive imaging.
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Hard-oxide durability – Ion-assisted coating survives heat, humidity, solvents, and repeated cleaning.
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Tailor-made 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 & cytometry – Pass violet excitation and red emission while silencing green background for cleaner contrast.
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Raman & multispectral sensors – Block 532 nm or 561 nm laser lines yet keep violet and red Stokes/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 crack 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? M79508 filters can be coated, diced, and shipped to your exact specifications—fast.
