BH-A02 UV-IR Cut Filter
UV-IR-cut hot mirror: > 94 % T through 430–700 nm, < 1 % T below 390 nm and 765–935 nm—keeps colour bright while dumping heat and haze.
- Visible pass: 92–95 % T across 430 – 700 nm (colour-neutral)
- UV block: < 1 % T below ~390 nm (protects optics & sensors)
- NIR block: < 1 % T through 765 – 935 nm (heat relief)
- IR tail: ~71 % T > 1 µm (optional absorber flattens)
- Surface: > 10 H hard-oxide IBS; solvent & humidity safe
- Formats: 5 – 450 mm, 0.5 – 3 mm on Borofloat®, silica, PC
Learn more
BH-A02 is KUPO’s broadband UV-IR-cut filter that lets visible light race through while
booting ultraviolet haze and near-infrared heat back toward the source. Transmission clears
92 % by 430 nm, averages > 94 % across the full 430 – 700 nm band, and plunges below 1 % from
roughly 765 nm to 935 nm. A secondary window beyond 1 µm can be flattened with an optional
absorbing over-coat or tandem stack for detectors that reach that far.
The ion-beam-sputtered oxide coating scores > 10 H pencil hardness, shrugs off humidity,
thermal shock, and aggressive solvents, and is available on Borofloat®, fused silica, or
polycarbonate substrates cut to any outline from 5 mm chips to 450 mm plates in
0.5 – 3 mm thicknesses. Prototypes leave our fab in as little as two weeks.
Typical uses: daylight camera windows that reject UV haze & NIR bloom, LCD/DLP projector
heat shields, machine-vision housings, microscope illuminators that spare live specimens, and
AR/VR combiners needing bright imagery without thermal load.
Description
BH-A02 is a broadband UV-IR-cut filter that lets visible light race through while knocking out ultraviolet and the first kilohertz of near-infrared. Transmission rises above 92 % by ~430 nm, stays > 90 % across the entire 430 – 700 nm band, and then plunges below 1 % from roughly 765 nm to 935 nm. A secondary transmission window appears beyond ~1000 nm; when true “all-IR-off” performance is required, an optional backside absorber or tandem stack can flatten that tail.
Key advantages
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Bright visible passband – > 94 % average T from 430 – 700 nm preserves colour fidelity and lumen output.
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Dual UV & NIR suppression – < 1 % T below ~390 nm and between 765 – 935 nm protects sensors and optics from stray energy.
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Hard, oxide IBS coating – withstands ≥ 10 H pencil, humidity, and thermal shock for outdoor and high-flux lighting rigs.
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Configurable IR tail – optional absorbing over-coat eliminates the > 1 µm leak for CCD/CMOS cameras or spectrographs with long-wave response.
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Made to order – round, square, or free-form, 5 – 450 mm, 0.5 – 3 mm thick on Borofloat®, fused silica, or polycarbonate.
Typical applications
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Digital still & cinema cameras – keep UV haze and NIR bloom off the Bayer array for sharper, truer colour.
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Machine-vision & ITS – pass daylight to the sensor while dumping heat that can shift focus or melt plastics.
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Projection & display engines – protect LCD/LCoS/DLP panels without dimming the white channel.
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Microscope illumination – deliver clean visible light to specimens while sparing them UV damage and IR heating.
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AR/VR combiners – inject bright imagery into see-through waveguides without thermal build-up.
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Architectural & stage lighting – maintain crisp white beams and protect gobos and lenses from IR-induced stress.
Need five prototypes in a week or twenty-thousand pieces next quarter? BH-A02 UV-IR-cut filters can be coated, diced, and shipped to your exact specification—fast.
FAQ
BH-A02 FAQ
What is BH-A02 and what is it used for?
BH-A02 is a UV-IR Cut. The BH-A02 UV-IR Cut filter delivers ultra-high visible transmission while simultaneously eliminating UV contamination and near-infrared noise. With peak transmission of 99.4 % at 686 nm and sustained >80 % transmission across the 420-700 nm visible window, this filter represents the most efficient visible pass-band in the series. Common uses include Color Digital Imaging, Confocal Microscopy, Spectrophotometry, and Flow Cytometry.
What are the key optical specs of BH-A02?
Key published specs for BH-A02 include Passband: 423 – 1020 nm; Bandwidth (FWHM): ~620 nm; Centre wavelength: ~725 nm (nominal); Passband transmittance: ≥ 89.4 % T (± 9.9 % ripple); Short-wave edge (T50): ≈ 415 nm, ~16 nm steepness.
What applications is BH-A02 best suited for?
BH-A02 is commonly used for Color Digital Imaging, Confocal Microscopy, Spectrophotometry, and Flow Cytometry. Color Digital Imaging - Delivers spectrally clean visible light to CCD/CMOS sensors, preventing UV-induced dark current and NIR thermal noise from degrading color accuracy.
Can BH-A02 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-A02 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge shifting, passband widening/narrowing, asymmetric blocking, rapid prototypes. Custom Format Flexibility - Round, square, and free-form geometries available from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrate options.
What should I know about angle of incidence and durability for BH-A02?
The published angle of incidence for BH-A02 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
