BH-A53 Hot Mirror & UV-IR Cut Filter
BH-A53 is a visible-pass, IR-blocking hot-mirror with a high, flat VIS plateau (~86–91 % T, ~430–690 nm) and a sharp cut just past ~720 nm; NIR stays in low single digits to ~1.0 µm with small features ~1.1–1.2 µm and only ~3–6 % T by 1.5 µm, while UV below ~390 nm is strongly suppressed.
- VIS window: ~86–91 % T across ~430–690 nm (ultra-flat)
- IR edge: Sharp cut just past ~720 nm; <~30 nm 10→90 % transition
- IR leakage: ~0.5–3 % T to ~1.0 µm; bounded peaks ~5–8 % near ~1.15–1.18 µm; ~3–6 % by 1.5 µm
- UV behaviour: Strong attenuation below ~390 nm
- Construction: Low-scatter, durable dielectric stack; abrasion & humidity resistant
- Substrates & format: Borofloat®, Eagle XG, D263 T, or soda-lime; 5–450 mm • 0.21–3.8 mm; rear-AR & slight wedge options
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The dense dielectric stack in BH-A53 preserves luminance and white balance while shedding IR that drives haze, flare, and thermal drift. Controlled long-wave features are confined beyond ~1.1 µm to minimize impact on common detector bands.
Typical applications • Digital & film cameras (neutral white balance, limited IR pollution) • Laser & UHP projectors (reflect 808–1064 nm) • AR/HUD combiners (bright imagery, low heat) • Photolithography & UV curing (reduce IR load on stages/optics) • Biomedical illumination (cool, shadow-free white light).
Need test chips tomorrow or thousands next quarter? BH-A53 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
BH-A53 is a visible-pass, IR-blocking hot-mirror. It holds a high, flat passband in the visible—about 86–91% T from roughly 430–690 nm—then makes a steep cut just past ~720 nm. Beyond the edge, near-IR transmission stays in the low single digits to ~1.0 µm, with small resonant features around ~1.1–1.2 µm and a gradual rise toward ~3–6% by 1.5 µm. UV below ~390 nm is strongly attenuated.
Key advantages
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Ultra-flat VIS window — ~86–91% T across ~430–690 nm preserves colour fidelity and luminance.
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Sharp ~720 nm edge — ~10-to-90% transition within <~30 nm cleanly separates visible and IR paths.
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Controlled IR leakage — typically ~0.5–3% T to ~1.0 µm, with bounded peaks of ~5–8% near ~1.15–1.18 µm and ~3–6% by ~1.5 µm.
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UV moderation — strong suppression below ~390 nm helps reduce fluorescence and sensor haze.
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Low-scatter, durable dielectric stack — abrasion and humidity resistant for field, stage, and lab use.
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Flexible glass choices — Borofloat®, Eagle XG, or D263 T (0.21–3.8 mm) for high-temp duty to ~450 °C; soda-lime for ≤150 °C. Custom sizes 5–450 mm; rear-surface AR and slight wedge available to suppress ghosts.
Typical applications
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Digital & film cameras — limit IR pollution while keeping white balance neutral.
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Laser & UHP projectors — reflect stray 808–1064 nm away from phosphor wheels and LCD engines.
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AR/HUD combiners — pass bright imagery and shed heat in compact waveguides.
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Photolithography & UV curing — pass process light while reducing IR load on stages and optics.
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Biomedical illumination — deliver cool, shadow-free white light to microscopes, endoscopes, and head-lamps.
Need test chips tomorrow or thousands next quarter? BH-A53 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
