O1911 Longpass Filter
Long-pass filter blocking cool cyan (< 570 nm) while passing 92 – 95 % warm orange-to-red light (600 – 775 nm) with colour-neutral flatness.
- Passband: 600 – 775 nm, 92 – 95 % T (± 2 % ripple)
- Cut-on (T50): ≈ 585 nm
- Edge steepness: ~15 nm (10 → 90 % transition)
- Blue-green blocking: < 1 % T below 555 nm
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Edge tuning, ripple smoothing, 45° AOI, rapid prototyping
Learn more
O1911 removes nearly every photon below ~570 nm, then delivers a broad,
colour-neutral window from rich orange through deep red. Transmission
stays under one percent to ~555 nm, crosses 50 % near 585 nm, clears
90 % by ~600 nm, and holds 92 – 95 % to at least 775 nm with ripple
constrained to ±2 %. Ion-assisted hard-oxide coatings shrug off heat,
humidity, solvents, and repeated cleaning. KUPO coats 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 can ship prototypes in about
two weeks.
Typical uses: LED colour tuning, orange/red fluorescence capture,
cyan-glare suppression in machine vision, daylight-to-tungsten warming for
photo & cinema lighting, and AR/HUD graphics injection without blue-green
bleed.
Description
O1911 removes almost every photon below about 570 nm and passes a smooth, colour-neutral band from rich orange out to the deep red. Measured transmission stays under 1 % through roughly 555 nm, crosses 50 % near 585 nm, clears 90 % by ~600 nm, and holds between 92 – 95 % up to at least 775 nm with spectral ripple contained to ±2 %. It is a straightforward way to warm LED or laser sources, isolate orange-to-red fluorescence, or strip cyan glare from machine-vision images.
Key advantages
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Consistent cyan cutoff – 50 % cut-on ≈ 585 nm; < 1 % T maintained below ~555 nm to minimise blue/green leakage.
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High, flat passband – 92 – 95 % T from ~600 nm to 775 nm keeps luminance and hue stable.
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Hard-oxide durability – Ion-assisted layers tolerate heat, humidity, solvents, and repeated cleanings.
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Format flexibility – 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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LED colour tuning – Remove cool spikes in white or RGB fixtures to create warm, amber-rich ambience.
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Fluorescence emission – Collect orange/red probes (Cy3, mCherry, Texas Red) while blocking cyan excitation lines.
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Machine vision – Strip cyan reflections from shiny parts while keeping the red channel bright for defect detection.
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Photography & cinema lighting – Warm daylight LED panels toward a tungsten look without gels.
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AR / HUD optics – Inject orange-to-red graphics cleanly, with negligible blue-green bleed toward the viewer.
Need rapid prototypes or high-volume supply? O1911 filters can be coated, diced, and shipped to your exact specifications—fast.
