Dual-pass filter delivering vivid blue (410 – 485 nm) and bright NIR (710 – 740 nm) while crushing green-to-deep-red light for clean, two-channel optics.
B8507 combines a vivid blue window with a strong near-infrared peak
while ruthlessly suppressing the green-to-deep-red band. Transmission
climbs past 80 % by 400 nm, holds 92 – 94 % through 410 – 485 nm, then
drops below 1 % just past 510 nm. After a dark trough between 520 – 680 nm
the curve rockets above 90 % near 710 nm, runs through 730 nm, and tails
to ~40 % by 780 nm. Ion-assisted hard-oxide coatings endure heat, humidity,
and solvents. KUPO can trim edges, suppress ripples, provide 45° AOI
versions, or cut large-format plates in as little as two weeks.
Typical applications: dual-channel fluorescence (blue excitation
+ far-red detection), machine-vision lighting with NIR alignment beams,
AR/VR waveguide injection, magenta stage lighting mixes, and spectroscopy
setups needing both 450 nm pumps and 730 nm reference lines.
B8507 combines a vivid blue window with a strong near-infrared peak while ruthlessly suppressing the green-to-deep-red band. Transmission crosses 80 % by 400 nm, settles into a 92 – 94 % plateau from roughly 410 nm to 485 nm, then plunges below 1 % just past 510 nm. After a dark trough through 520 – 680 nm the curve rockets back above 90 % near 710 nm, rides through 730 nm, and tails to ~40 % by 780 nm. The result: colour-pure blue for excitation or imaging, a clean mid-band notch, and a bright NIR window for alignment or dual-wavelength sensing.
Key advantages
High-clarity blue passband — >90 % T across 410 – 485 nm maximises signal for inspection, curing, or fluorescence excitation.
Deep 520 – 680 nm blocking — <0.5 % T knocks out green and red flare, boosting contrast.
Strong 710 – 740 nm NIR peek — ≈90 % T simplifies coaxial alignment or adds a second sensing channel without extra optics.
Ultra-steep edges — 10 nm transitions separate passbands from stopbands with minimal colour bleed.
Hard-oxide durability — Ion-assisted coating survives heat, humidity, solvents, and repeated wipe-downs.
Rapid custom options — Edge trims, ripple suppression, 45 ° AOI versions, or large formats ship in as little as two weeks.
Typical applications
Dual-channel fluorescence — Excite CFP/FITC with blue, collect far-red probes via the NIR window, while blocking mid-visible autofluorescence.
Machine-vision & metrology — Combine high-contrast blue illumination with NIR reference beams for 3-D triangulation or surface inspection.
AR/VR waveguides — Inject blue graphics and NIR tracking signals yet keep green-red leakage out of the eye path.
Stage & architectural lighting — Produce saturated magenta mixes (blue + far-red) without unwanted green spill.
Spectroscopy & Raman — Isolate 450 nm pump beams and 730 nm reference lines to improve baseline stability.
Need hexagonal blanks, mini chips for fibre ferrules, or volume OEM supply? KUPO Optics can prototype and ship B8507 from 10 mm slivers up to 300 mm plates to keep your project moving.