Floods the scene with 95 % visible light, slices a 710 nm notch, and slips in a 750 nm alignment peek—all in one BH-A14 glass.
BH-A14 is KUPO’s hybrid filter for colour-critical lighting and imaging. A dense ion-beam-sputtered dielectric rockets past 95 % T by 500 nm, rides a flat > 90 % plateau through the mid-visible, then carves a selective dip around 710 nm to knock out far-red spill that muddies plant-health and biomedical scenes. Immediately after, the curve rebounds above 90 % between 742 nm and 753 nm—handy for coaxial alignment dots or NDVI reference bands—before tapering into the IR. The coating meets MIL abrasion and humidity specs, and KUPO can shift the notch, flatten the NIR window, or supply 0 °-AOI versions in lead times as short as two weeks, cut from 10 mm chips to 300 mm panels to keep your project moving.
BH-A14 is KUPO Optics’ hybrid filter that floods cameras or stages with a bright 790–675 nm band while carving out a selective dip near 710 nm and offering a secondary window around 750 nm. The hard-oxide stack rockets from near-zero transmission below 455 nm to about 95 % by ~500 nm, holds a >90 % plateau through the mid-visible, then drops to roughly 55 % at 710 nm before rebounding above 90 % between 742 nm and 753 nm. The visible output stays colour-neutral and punchy, the notch suppresses unwanted far-red spill, and the NIR peek enables quick alignment or multispectral sensing without extra optics.
Key advantages
High-clarity 500–650 nm pass — ≥94 % peak T delivers vivid cyan-to-orange illumination or imaging throughput.
Targeted 710 nm notch — ~40 nm-wide dip knocks down chlorophyll or far-red flare, enhancing contrast in plant and biomedical scenes.
Built-in 750 nm peek — Controlled 90 % transmission window provides an easy alignment beacon or NIR reference channel.
Hard-oxide durability — Ion-assisted layers shrug off heat, humidity, solvents, and repeated cleaning.
Fast customisation — Shift the notch, flatten the NIR window, or supply 0 ° AOI versions within rapid lead times.
Typical applications
Plant-health imaging — Pass visible light for RGB capture, notch out chlorophyll fluorescence, and use the 740 nm peek for vegetation indices.
Multicolour fluorescence — Excite GFP-like dyes while suppressing far-red bleed-through; the NIR window aids dual-channel work.
Machine-vision lighting — Combine white LEDs with a tailored red cut for PCB or fruit inspection, plus NIR alignment.
Stage & architectural fixtures — Produce crisp daylight-balanced washes; the notch reduces red heat on performers while the 740 nm peek supports IR tracking.
AR waveguides & HUDs — Inject bright visible content, suppress eye-distracting deep-red, and leave a controlled NIR port for gaze-tracking diodes.
Need trapezoids, hexagons, or volume OEM runs? KUPO Optics can prototype and ship BH-A14 from 10 mm chips up to 300 mm panels to keep your project moving.