BH-A10 Hot Mirror / Broadband NIR Reflector

BH-A10 is KUPO Optics’ high-performance hot-mirror coating designed for applications requiring precise heat management and visible light transmission. Its advanced dielectric stack efficiently separates the electromagnetic spectrum, transmitting visible light with high fidelity while reflecting a broad band of near-infrared (NIR) energy. The result is a thermally protected optical path with a crystal-clear, color-true view.

At a 45° angle of incidence, the coating demonstrates excellent visible transmission, with reflectance staying below 15% across the 400–750 nm range. The curve then shifts dramatically, rocketing past 90% reflectance at 820 nm and stay > 95% throughout the critical 850–1000 nm NIR band. This provides powerful heat reflection exactly where it’s needed most, while keeping the visible spectrum clear for imaging or observation.

Key Advantages

• Exceptional IR Reflection – Near-total reflectance (>95%) across the wide 850–1000 nm band provides powerful, targeted heat rejection, protecting sensitive sensors and components.

• High-Fidelity Visible Transmission – Allows the full visible spectrum to pass through with minimal reflection, ensuring color-accurate performance for cameras, projectors, and sensors.

• Precision Wavelength Cut-On – The sharp transition from high transmission to high reflection ensures efficient separation of visible light and NIR heat.

• Low-Scatter, λ/10 Flatness – A front-surface dielectric on a polished glass substrate maintains wave-front quality for high-resolution imaging and precision optical systems.

• Rugged & Cleanable – The hard-oxide coating is durable and resistant to humidity, solvents, and repeated cleaning, making it suitable for demanding industrial and field environments.

• Rapid Customization – KUPO stocks common sizes, but custom shapes, substrates, or designs tuned for a specific angle of incidence (AOI) can be manufactured and delivered quickly.

Typical Applications

• Digital Imaging & Projection – Protect CMOS/CCD sensors, LCD panels, and other electronics from thermal damage caused by high-intensity lamps or LED light sources.

• Machine Vision & Automated Inspection – Block infrared interference from illumination sources or ambient industrial heat to ensure color accuracy and prevent sensor saturation.

• Scientific & Medical Instrumentation – Isolate and remove heat from the optical path in microscopy, flow cytometry, and analytical equipment to protect biological samples and ensure stable measurements.

• Retail & Museum Lighting – Illuminate heat-sensitive products or priceless artifacts without subjecting them to damaging infrared radiation.

• Semiconductor & Solar Applications – Manage thermal loads and protect process optics in manufacturing and testing environments.

Need a specific diameter, an AR-coated back surface, or a different cut-on wavelength? Talk to KUPO Optics today—our engineering team can tailor the BH-A10 to your optical path and ship prototype parts fast.