BH-A14 Blue Reflection Mirror
BH-A14 redirects the full blue < 460 nm band at 45° while pouring > 95 % of green + red (470 – 680 nm) straight through—delivering wide-gamut colour separation and cooler, brighter light engines.
- GR transmission: > 95 % from 470 – 680 nm @ 45 ° AOI
- Blue reflection: < 1 % T below 450 nm (≥ 99 % R)
- Edge steepness: 10 nm 10-90 % crossover for minimal overlap
- IR control: Optional 94 % peek ≈ 760 nm, < 20 % T > 800 nm
- Power handling: > 10 W / cm² CW RGB-laser rated
- Glass options: Borofloat®, Eagle XG, D263 T, soda-lime • 5 – 450 mm • 0.21 – 3.8 mm
Learn more
BH-A14 is the green-red leg of an RGB dichroic set. Its single hard-oxide
stack reflects ≥ 99 % of the blue pump band into the B-panel or phosphor wheel, while
transmitting the green and red primaries with > 95 % efficiency to maximise ANSI lumen
output. A steep 10 nm edge leaves virtually no overlap with the complementary
blue-pass mirror, enabling > 90 % colour-gamut coverage and tight corner uniformity
in 3-chip LCD, DLP® or LCoS projection engines.
The low-absorption design shrugs off > 10 W cm-2 of CW laser-phosphor flux
without colour drift, and spectral shift stays < ±5 nm for AOIs 40 – 50 °, easing
tolerance stacks in compact prisms. Need a cooler engine? A controlled 760 nm window
vents residual heat or feeds an NIR focus sensor—delete it if you prefer a dead-flat IR
block.
Popular uses: RGB projection prisms • laser-phosphor wheels • HUD / AR combiners •
blue-line machine-vision sources • three-band multispectral cameras.
Description
BH-A14 is a 45 ° incidence blue-reflection dichroic mirror engineered for three-panel LCD, DLP®, LCoS and laser-phosphor engines. Its coating blocks the entire blue band (< 460 nm) while delivering > 95 % transmission from roughly 470 nm to 680 nm, so green-and-red primaries speed straight through the prism with minimal color shift. Beyond ≈ 700 nm the coating attenuates NIR spill that can over-heat light engines or degrade contrast, yet still offers a controlled window (~ 94 % T) around 760 nm when a second-order IR path is required.
Key advantages
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> 95 % transmission 470 – 680 nm – sends green and red channels through the combiner with virtually no loss.
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< 1 % leakage below 450 nm – reflects the blue pump or LED band cleanly into its optical arm.
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Steep 10 nm transition edge – minimises overlap with the blue-pass mirror for wide-gamut projectors.
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Low-absorption oxide stack – handles > 10 W cm⁻² CW RGB-laser loads without colour drift.
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Versatile glass choices – Borofloat®, Eagle XG or ultra-thin D263 T (up to 450 °C duty) and economical soda-lime (≤ 150 °C), cut from 5 mm to 450 mm and 0.21 – 3.8 mm thick.
Typical applications
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RGB projection prisms – reflect blue into the B-panel and transmit GR for bright, colour-accurate imagery.
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Laser-phosphor light engines – separate blue pump light from green/red phosphor output without extra plates.
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Head-up & AR combiners – inject colour imagery while keeping daylight reflections out of the driver’s eye-box.
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Machine-vision illumination – create pure blue lines while passing red/NIR inspection light to the camera.
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Multispectral cameras – isolate the visible GR band while rejecting UV/blue excitation or NIR flare.
Need samples tomorrow or thousands next quarter? BH-A14 mirrors are coated, diced and shipped to your exact spec—fast.
