HM-650 Hot Mirror & UV-IR Cut Filter
HM-650 is a visible-pass, IR-blocking hot mirror: ~95–98 % T from ~420–640 nm with strong UV suppression <~390 nm, a sharp long-wave cut near ~650–670 nm, ~0–1 % T through ~720–1100 nm (minor ripples), then a rise >~1.15 µm to ~15–20 % T by ~1.2 µm.
- VIS window: ~95–98 % T, 420–640 nm (ultra-flat)
- IR edge: Sharp 10→90 % transition at ~650–670 nm
- IR blocking: ≈0–1 % T ~720–1100 nm; minor ripples; upturn >~1.15 µm to ~15–20 % @ ~1.2 µm
- UV behaviour: Strong attenuation below ~380–390 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)
Learn more
HM-650 preserves colour fidelity and luminance while shunting heat-carrying NIR away from sensors and optics. Use where tight VIS neutrality and deep blocking to ~1.1 µm matter—cameras, projectors, AR/HUD, machine vision, microscopy, and biomedical lighting. For ultra-low SWIR, pair with a secondary blocker.
Need test chips tomorrow or thousands next quarter? HM-650 hot-mirrors are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
HM-650 is a visible-pass, IR-blocking hot mirror. It holds a high, flat passband at ~95–98% T from roughly 420–640 nm, with strong UV suppression below ~380–390 nm. Past the visible it makes a steep long-wave cut near ~650–670 nm; through ~720–1100 nm the transmission stays at or near the baseline (≈0–1% T typical) with small resonant features. Beyond ~1.15 µm the curve rises again, reaching ~15–20% T by ~1.2 µm.
Key advantages
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Ultra-flat VIS window — ~95–98% T from 420–640 nm preserves colour fidelity and luminance.
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Sharp ~650–670 nm edge — fast 10-to-90% transition cleanly separates visible and near-IR paths.
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IR blocking to ~1.1 µm — ≈0–1% T typical from ~720–1100 nm; minor ripples and an upturn beyond ~1.15 µm.
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UV moderation — steep short-wave cutoff (~<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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Projectors & light engines — reflect heat-carrying NIR away from phosphor wheels and LCD engines.
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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? HM-650 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
