Dual-pass filter with vivid blue (410 – 485 nm) and bright NIR (735 – 755 nm) windows separated by deep 520 – 700 nm blocking for maximum contrast.
B71408 delivers two crystal-clear windows—one in the blue (≈ 400 – 490 nm)
and a second in the near-infrared (≈ 730 – 755 nm)—while driving the entire
green-to-deep-red band down to detector-noise levels. Transmission tops 90 %
by 410 nm, stays flat to roughly 485 nm, then plunges below 1 % just past
510 nm. After a dark trough through 520 – 700 nm, the curve rockets above
90 % near 735 nm, peaks around 745 nm, and tapers toward 35 % by 780 nm.
Ion-assisted hard-oxide coatings shrug off heat, humidity, and solvents,
and KUPO can trim edges, suppress ripples, supply 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 reference beams,
AR/VR waveguide injection, magenta stage lighting mixes, and spectroscopy
that needs both 450 nm pumps and 745 nm reference lines.
B71408 delivers two crystal-clear windows—one in the blue (≈ 400 – 490 nm) and a second in the near-infrared (≈ 730 – 755 nm)—while driving the entire green-to-deep-red band down to detector-noise levels. Transmission tops 90 % by 410 nm, stays flat to roughly 485 nm, then plunges below 1 % just past 510 nm. After a dark trough through 520 – 700 nm, the curve rockets back above 90 % near 735 nm, peaks around 745 nm, and tapers toward 35 % by 780 nm. The result is bright, colour-pure blue and NIR channels separated by a deep notch for maximum contrast.
Key advantages
High-clarity blue passband — >90 % T across 410 – 485 nm maximises signal for curing, inspection, or fluorescence excitation.
Deep 520 – 700 nm blocking — <0.5 % T knocks out green and red flare, boosting SNR and colour purity.
Strong 735 – 755 nm NIR window — ≈90 % T provides a clean alignment or sensing band without extra optics.
Ultra-steep edges — ≈10 nm transitions sharply separate passbands from stopbands, minimising colour bleed.
Hard-oxide durability — Ion-assisted layers shrug off heat, humidity, solvents, and repeated wipe-downs.
Rapid custom options — Edge trims, ripple suppression, 45 ° AOI designs, 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 peek 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 eye-tracking signals while keeping green-red leakage out of the user’s view.
Stage & architectural lighting — Produce saturated magenta mixes (blue + far-red) without unwanted green spill or heat.
Spectroscopy & Raman — Isolate 450 nm pump beams and 745 nm reference lines to improve baseline stability.
Need hexagonal blanks, fibre-sized chips, or high-volume OEM supply? KUPO Optics can prototype and ship B71408 from 10 mm slivers up to 300 mm plates—fast.