Y76704 Longpass Filter
Long-pass filter blocking blue (< 510 nm) while passing ≥ 92 % warm green-to-red light (535 – 750 nm) with colour-neutral flatness.
- Passband: 535 – 750 nm, 92 – 95 % T (± 2 % ripple)
- Cut-on (T50): ≈ 535 nm
- Edge steepness: ~20 nm (10 → 90 % transition)
- Blue blocking: < 0.3 % T below 510 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
The Y76704 filter locks out nearly all violet-to-blue light, then delivers
a broad, colour-neutral band from ~535 nm deep into the red. Transmission
is essentially zero below 510 nm; by ~535 nm it jumps past 92 % and stays
between 92 – 95 % out to 750 nm with ripple held to ± 2 %. The ~20 nm
edge cleanly splits cool and warm tones, while the hard-oxide coating
shrugs off heat, humidity, solvents, and frequent 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.
Description
The Y76704 cuts off nearly all violet-to-blue light, then delivers a broad, colour-neutral band from ≈ 530 nm all the way into the deep red. Below 510 nm transmission is essentially zero; by ~535 nm it jumps past 92 % and stays between 92 – 95 % out to 750 nm, with ripple held to about ±2 %. Use it to warm LED sources, isolate green-to-red fluorescence, or remove blue glare in vision systems.
Key advantages
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Steep blue cutoff – ~20 nm transition cleanly separates blue/cyan from green, maximising colour contrast.
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High, flat passband – ≥ 92 % T from ~535 nm to 750 nm keeps brightness and hue consistent.
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Deep blue suppression – < 0.3 % T below 510 nm protects detectors and eliminates harsh LED peaks.
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Hard-oxide durability – Ion-assisted layers shrug off heat, humidity, solvents, and frequent cleaning.
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Made to fit – 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.
Typical applications
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LED colour-tuning – Filter out blue spikes in cool-white or RGB fixtures to achieve cosy, amber-rich ambience.
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Fluorescence emission – Collect GFP/YFP/RFP signals while blocking blue excitation bands.
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Machine vision – Suppress specular blue reflections on metal or glass while keeping red and green channels bright.
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Photography & cinema – Warm daylight LEDs toward tungsten without gels; maintain high transmission for efficient lighting.
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AR / HUD combiners – Inject green-to-red graphics cleanly, with zero blue leakage into the viewer’s eye.
Need prototypes fast or high-volume supply? KUPO Optics can coat, dice, and ship Y76704 filters to your exact specs—swiftly.
