BH-A13 Red Transmission Mirror
BH-A13 funnels the full 580 – 730 nm red band through your 45° light engine while kicking blue-green energy out of the path—delivering razor-clean colour and cooler optics.
- Red passband 580–730 nm: > 95 % transmission @ 45 ° AOI
- Blue/green leakage < 550 nm: < 1 % T (≥ 99 % R)
- Edge steepness: 8 nm 10–90 % transition for wide-gamut combiners
- Damage threshold: > 10 W / cm² (CW RGB-laser rated)
- Custom glass: Borofloat®, Eagle XG, D263 T, soda-lime
5 – 450 mm, 0.21 – 3.8 mm
Learn more
BH-A13 is the red leg in an RGB dichroic set: it transmits >95 % of
orange-to-crimson light while its <1 % stopband below 550 nm keeps green and blue
completely out of the channel. A steep 8 nm edge lets you butt the mirror up
against a complementary green-pass element without gamut-robbing overlap.
Ion-beam-sputtered oxides give the stack a >10 H pencil hardness and survive >10 W / cm²
in laser-phosphor engines or 3-chip LCD/DLP® projectors. Spectral shift stays inside
±5 nm for AOI changes of 40 – 50 °, preserving corner uniformity even in fast telecentric
designs.
KUPO keeps common prism plates in stock and can tweak edge positions, add backside
AR, or supply odd shapes down to 5 × 5 mm—and up to 450 mm—for rapid prototyping or
volume production.
Typical uses: RGB projection prisms • laser-phosphor engines •
HUD / AR combiners • red-line machine-vision illuminators • three-band filter
wheels in multispectral cameras.
Description
BH-A13 is a 45 ° dichroic red-pass mirror that channels the red primary (≈ 580 – 730 nm) through your projection or imaging path while bouncing away all blue-green energy. The coating’s flat-top passband delivers > 95 % throughput from the orange edge of the spectrum right up to deep-red, then falls sharply to suppress near-IR spill that can wash out contrast or overheat light-engine components.
Key advantages
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> 95 % transmission 580 – 730 nm – maximises red luminance in 3-LCD, DLP® and LCoS combiners.
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< 1 % leakage below 550 nm – keeps stray blue/green out of the red channel for razor-clean colour separation.
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Steep 8 nm transition edge – minimal overlap with green mirror for wide-gamut, high-corner-uniformity projectors.
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High-laser-damage oxide stack – survives > 10 W cm-² CW or pulsed RGB-laser illumination.
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Custom-cut optics – Borofloat®, Eagle XG, ultra-thin D263 T (≤ 450 °C) or soda-lime (≤ 150 °C) | 5 – 450 mm size, 0.21 – 3.8 mm thick.
Typical applications
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RGB projection prisms – pass red to the R-panel while reflecting green/blue into their arms.
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Laser-phosphor engines – separate red phosphor output from pump bands without extra glass.
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HUD / AR combiners – inject bright red symbology while blocking stray daylight reflections.
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Machine-vision illumination – create pure red lines or spots for high-contrast defect detection.
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Multispectral cameras – isolate the red channel cleanly in three-band or five-band filter wheels.
Need quick prototypes or high-volume lots? BH-A13 mirrors are coated, diced and shipped to your spec—fast.
