BH-A50 Hot Mirror & UV-IR Cut Filter
BH-A50 is a visible-pass, IR-blocking hot mirror: a high, flat VIS plateau (~88–94 % T, ~430–690 nm), a sharp long-wave cut just past ~710–730 nm, low single-digit %T to ~1.0 µm with bounded resonances (~5–8 % peaks ~0.9–1.4 µm), and strong UV attenuation below ~390 nm.
- VIS window: ~88–94 % T across ~430–690 nm (ultra-flat)
- IR edge: Sharp cut just past ~710–730 nm; fast 10→90 % transition
- IR leakage: Low single-digit %T to ~1.0 µm; bounded peaks ~5–8 % at ~0.9–1.4 µm
- UV behaviour: Strong short-wave suppression below ~390 nm
- Durability: Low-scatter hard dielectric; 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 (to ~450 °C; ≤150 °C for soda-lime)
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BH-A50 preserves luminance and neutral white balance while shedding heat-carrying NIR and trimming UV that drives fluorescence and sensor haze. Controlled long-wave resonances are bounded and kept to low single digits through ~1.0 µm.
Typical applications • Digital & film cameras (limit IR pollution, neutral WB) • Projectors & light engines (reflect NIR away from phosphor wheels/LCD engines) • Machine vision & human-viewing optics (true-colour to Si sensors) • AR/HUD combiners (bright imagery, managed thermal load) • Microscopy & biomedical illumination (cool, shadow-free white).
Need test chips tomorrow or thousands next quarter? BH-A50 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
BH-A50 is a visible-pass, IR-blocking hot mirror. It holds a high, flat passband in the visible—about 88–94% transmittance from roughly 430–690 nm—then makes a steep long-wave cut just past ~710–730 nm. In the near-IR, transmission stays in the low single digits through ~1.0 μm, with bounded resonant features between ~0.9–1.5 μm (peaks ~5–8%). UV below ~390 nm is strongly attenuated.
Key advantages
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Ultra-flat VIS window — ~88–94% T from ~430–690 nm preserves colour fidelity and luminance.
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Sharp ~720 nm edge — fast 10-to-90% transition cleanly separates visible and IR paths.
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Controlled IR leakage — generally low single-digit %T to ~1.0 μm, with limited peaks (~5–8%) near ~0.9–1.4 μm.
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UV moderation — strong short-wave cutoff (<~390 nm) helps reduce fluorescence and sensor haze.
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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.
-
Projectors & light engines — reflect heat-carrying NIR away from phosphor wheels and LCD engines.
-
Machine vision & human-viewing optics — pass true-colour images to Si sensors while trimming out-of-band light.
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AR/HUD combiners — bright imagery with managed thermal load in compact waveguides.
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Microscopy & biomedical illumination — deliver cool, shadow-free white light to instruments.
Need test chips tomorrow or thousands next quarter? BH-A50 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
