R15 Longpass Filter
Long-pass filter blocking green-cyan (< 605 nm) while passing 92–94 % rich red light (645 – 770 nm) for warm, glare-free output.
- Red passband: 645 – 770 nm, 92 – 94 % T (± 2 % ripple)
- Cut-on (T50): ≈ 630 nm
- Edge steepness: ~20 nm (10 → 90 % transition)
- Blue-green blocking: < 1 % T below 605 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
R15 holds transmission below one percent up to about 605 nm, reaches 50 %
near 630 nm, and clears 90 % by ~645 nm. It then rides a smooth 92–94 %
plateau past 770 nm with ripple contained to ±2 %. The ion-assisted
hard-oxide coating resists heat, humidity, solvents, and repeated cleaning.
KUPO can deliver filters on 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
R15 holds transmission below 1 % right up to about 605 nm, reaches the 50 % point close to 630 nm, and clears 90 % by roughly 645 nm. It then rides a smooth 92–94 % plateau through at least 770 nm, with ripple contained to ±2 %. The curve is built for applications that need clean, high-power red output—warming LED fixtures, capturing far-red fluorescence, or stripping green glare from machine-vision views—without stacking extra gels or filters.
Key advantages
-
Sharp green-cyan cutoff – 50 % cut-on ≈ 630 nm; < 1 % T maintained to ~605 nm, minimising shorter-wavelength leak.
-
High, flat red passband – 92–94 % T from ~645 nm to 770 nm keeps brightness and colour balance stable.
-
Hard-oxide durability – Ion-assisted coating resists heat, humidity, solvents, and repeated cleaning.
-
Flexible formats – 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
-
LED colour tuning – Remove cool spikes in white or RGB fixtures to create a warm, red-rich ambience.
-
Fluorescence emission – Collect far-red probes (Cy5, Alexa 647, mPlum) while blocking green-cyan excitation.
-
Machine vision – Strip cyan reflections from reflective parts while keeping the red channel bright for defect detection.
-
Photography & cinema lighting – Warm daylight LED panels toward a tungsten look without gels.
-
AR / HUD optics – Inject red graphics cleanly, with negligible blue-green bleed toward the viewer.
Need a quick prototype or a high-volume run? R15 filters can be coated, diced, and shipped to your exact specifications—fast.
