BH-A12 Green Transmission Mirror
BH-A12 funnels the entire 470 – 575 nm green band through your 45 ° light engine while kicking blue-violet and red/IR light back where it belongs—delivering pure colour and cooler optics.
- Green passband 470–575 nm: > 95 % transmission @ 45 ° AOI
- Red block 600–700 nm: < 1 % T (≥ 99 % R) for razor-clean separation
- IR tail > 730 nm: Controlled 15 – 25 % T vents lamp/laser heat
- Damage threshold: Hard-oxide IBS stack rated > 10 W / cm²
- Angle stability: < ±5 nm spectral drift 40–50 ° AOI
- Custom glass: Borofloat®, Eagle XG, D263 T, soda-lime | 5 – 450 mm, 0.21–3.8 mm
Learn more
BH-A12 is purpose-built for RGB projection prisms, laser-phosphor converters and
AR/HUD combiners that demand a flat, high-gain green while suppressing colour-skewing red bleed.
The dielectric design passes >95 % throughout the eye-sensitive 470–575 nm zone, then plunges
below 1 % by 600 nm—ensuring the red channel stays locked out. A modest, intentionally reflective
IR shoulder above 730 nm dumps residual heat, protecting LC panels, phosphors and adhesives from thermal stress.
Deposited via ion-beam sputtering, the coating survives 24/7 duty cycles at > 10 W / cm²,
meets MIL adhesion/abrasion tests, and keeps wave-front error < λ/10 so high-resolution images
stay razor-sharp.
KUPO keeps popular prism sizes in stock and can shift edge positions, add backside AR or supply odd
shapes as small as 5 × 5 mm or up to 450 mm plates—often in under two weeks.
Description
BH-A12 is a 45 ° dichroic green-pass mirror that cleanly pipes the green primary (≈ 470 – 575 nm) through your light engine while reflecting the blue-violet and red/IR bands. The coating transmits > 95 % across the flat-top passband, then plunges to < 1 % beyond ~600 nm to prevent red bleed-through that would desaturate images or skew colour balance. A modest rise above 730 nm lets stray heat escape the prism, keeping downstream optics cool without sacrificing visible contrast.
Key advantages
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> 95 % transmission 470 – 575 nm – maximises green luminance in RGB combiners and phosphor wheels.
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Deep out-of-band blocking (< 1 % 600 – 700 nm) – razor-sharp colour separation for 3-LCD, DLP® and LCoS engines.
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Hard, high-damage-threshold oxide stack – endures > 10 W cm-² irradiance and 24/7 duty cycles.
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Low angular shift at 45 ° AOI – maintains spectral flatness across the field.
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Custom-cut optics – Borofloat®, Eagle XG, ultra-thin D263 T (≤ 450 °C) or soda-lime (≤ 150 °C) from 5 × 5 mm to 450 mm, 0.21 – 3.8 mm thick.
Typical applications
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RGB projection prisms – route green to the G-panel while reflecting blue and red to their paths.
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Laser-phosphor converters – separate green phosphor output from pump wavelengths, boosting gamut.
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HUD / AR combiners – inject vivid green symbology with minimal red ghosting.
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Machine-vision illumination – create a pure green beam for colour-coded inspection lines.
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Multispectral cameras – isolate the green channel without adding extra glass or filters.
Need prototypes tomorrow or volume lots next quarter? BH-A12 mirrors are coated, diced and shipped to your drawing—fast.
