Dielectric hot-mirror: > 92 % T from 420–690 nm, < 1 % T through 745–1065 nm—venting IR heat while keeping visible colour true.
BH-A01 is KUPO’s all-dielectric hot-mirror designed to dump near-infrared heat while
passing bright, colour-neutral visible light. Transmission crosses 90 % by ~420 nm and rides
92–95 % out to 690 nm, then drops below 1 % for most of 745–1065 nm—protecting CMOS/CCD
sensors, LCD panels, and optics from IR load. A secondary window (~71 % T) appears beyond
1.15 µm; if your detector is sensitive there, KUPO can add a backside absorber to flatten it.
Coatings are ion-assisted for > 10 H pencil hardness and survive humidity, UV, solvents,
and wipe-downs. Parts ship on Borofloat®, fused silica, or polycarbonate blanks cut to any
outline—from 5 mm chips to 450 mm plates—in thicknesses of 0.5–3 mm, with prototypes
leaving our fab in as little as two weeks.
Typical uses: sensor cover glass, LCD/DLP projector heat management, surgical
illumination, high-power LED or arc-lamp fixtures, and AR/VR combiners that must pass visible
graphics while rejecting headset IR tracking beams.
BH-A01 is an all-dielectric hot-mirror that lets visible light sail through while kicking near-infrared heat back toward the source. Transmission climbs above 90 % by ~420 nm, stays between about 92 – 95 % out to 690 nm, then plunges below 1 % for the bulk of the 745 – 1065 nm region. A secondary window appears beyond 1.15 µm (≈ 71 % T), which can be suppressed with an optional backside absorber if your detector is sensitive that far out.
Key advantages
Bright, neutral visible passband – > 92 % average transmission from 420–690 nm preserves colour balance and luminance.
Deep NIR blocking – < 1 % T through most of 745–1065 nm keeps sensors cool and prevents IR bleed.
Hard, easy-clean surface – oxide stack scores > 10 H on the pencil-hardness scale and shrugs off solvents, humidity, and UV.
Scalable formats – round or square parts from 5 mm to 450 mm, 0.5–3 mm thick, on Borofloat®, fused silica, or polycarbonate substrates.
Typical applications
CMOS / CCD sensor covers – cut IR before it hits the Bayer filter for crisp daylight video and stills.
LCD & DLP projectors – divert lamp heat to extend panel life without adding fan noise.
Medical illumination – filter surgical headlights or microscopes to protect tissue from IR loading.
Architectural and stage lighting – keep lenses and gobos cooler in high-power LED or arc-lamp fixtures.
AR/VR combiners – inject visible imagery while rejecting headset IR tracking beams.
Need a prototype fast or thousands of production parts? BH-A01 hot-mirror blanks can be coated, diced, and shipped to your exact spec on a timeline that keeps your project on track.