R2714 Longpass Filter
Long-pass filter blocking green-cyan (< 595 nm) while passing 92–94 % clean red light (625 – 770 nm) for warm, glare-free output.
- Red passband: 625 – 770 nm, 92 – 94 % T (± 2 % ripple)
- Cut-on (T50): ≈ 610 nm
- Edge steepness: ~15 nm (10 → 90 % transition)
- Blue-green blocking: < 1 % T below 595 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 prototypes
Learn more
R2714 keeps transmission below one percent up to ~595 nm, crosses 50 % near
610 nm, clears 90 % by ~625 nm, and then rides a smooth 92–94 % plateau
through at least 770 nm with ripple held to ±2 %. The ion-assisted
hard-oxide coating shrugs off heat, humidity, solvents, and repeated
cleaning. KUPO can supply 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: LED colour tuning, far-red fluorescence capture,
green-glare suppression in machine vision, daylight-to-tungsten warming for
film lighting, and AR/HUD red-graphic injection without blue-green bleed.
Description
R2714 keeps transmission below 1 % up to roughly 595 nm, reaches 50 % near 610 nm, and passes the 90 % mark by about 625 nm. It then rides a smooth 92–94 % plateau through at least 770 nm with ripple confined to ±2 %. The profile is tuned for applications that need clean red light—warming LED fixtures, collecting far-red fluorescence, or stripping green glare from machine-vision images—without relying on gels or multiple filters.
Key advantages
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Sharp green-cyan cutoff – 50 % cut-on ≈ 610 nm; <1 % T maintained to ~595 nm to minimise shorter-wavelength leak.
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High, flat red passband – 92–94 % T from ~625 nm to 770 nm keeps luminance and hue consistent.
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Hard-oxide durability – Ion-assisted coating resists heat, humidity, solvents, and repeated cleaning.
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Format versatility – Round, square, or custom 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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LED colour tuning – Remove cool spikes in white or RGB fixtures to create warm, red-rich ambience.
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Fluorescence emission – Collect far-red probes (Cy5, Alexa 647, mPlum) while blocking green-cyan excitation.
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Machine vision – Strip green reflections from reflective 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 red graphics cleanly, with negligible blue-green bleed toward the viewer.
Need a quick prototype or a high-volume run? R2714 filters can be coated, diced, and shipped to your exact specifications—fast.
