HM-745 Hot Mirror & UV-IR Cut Filter
HM-745 passes VIS at ~92–95 % T (400–740 nm) then knife-edges at 745–760 nm to <0.1 % T in the NIR—bright, colour-neutral white minus IR haze/heat. A small ripple >~1.1 µm (minor ~1.18 µm) sits outside Si and most short-wave InGaAs use.
- VIS window: ~92–95 % T, 400–740 nm (ultra-flat)
- IR edge: 745–760 nm knife-edge; <~20 nm (10→90 % transition)
- IR rejection: <0.1 % T (typ.) ~790–1050 nm; low ripple >~1.1 µm (minor ~1.18 µm)
- Durability: Low-scatter hard dielectric; abrasion & humidity resistant
- Substrates: Borofloat®, Eagle XG, D263 T (0.21–3.8 mm); soda-lime ≤150 °C
- Format & options: 5–450 mm; rear-surface AR & slight wedge to suppress ghosts
Learn more
HM-745 keeps luminance and white balance while dumping near-IR that drives haze, flare, and thermal drift. The controlled long-wave ripple is pushed beyond common Si bands and most short-wave InGaAs setups.
Typical applications • Digital/film cameras • Laser & UHP projectors (808–1064 nm control) • AR/HUD combiners • Photolithography/UV curing • Biomedical illumination.
Need test chips tomorrow or thousands next quarter? HM-745 filters are coated and cut-to-size (including dicing) to your spec—fast.
Description
HM-745 is a visible-pass, IR-blocking hot-mirror that holds ~92–95% T across the eye-sensitive 400–740 nm band, then makes a knife-edge cut near 745–760 nm to drive the near-IR down to <0.1% T. You get bright, colour-neutral white light while dumping the IR that causes haze, flare and thermal drift. A small residual ripple appears beyond ~1.1 μm with a minor feature near ~1.18 μm, typically outside Si and most short-wave InGaAs imaging ranges.
Key advantages
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Ultra-flat VIS window — 92–95% T from 400–740 nm preserves true colour and maximum luminance.
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Sharp 745 nm edge — <~20 nm 10-to-90% transition cleanly separates visible and IR paths.
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Controlled IR rejection — <0.1% T (typ.) from ~790–1050 nm reduces sensor bloom and heat; only low residual ripple beyond ~1.1 μm.
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Low-scatter, dielectric durability — rugged stack resists abrasion and humidity for field, stage and lab gear.
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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 — eliminate 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, reject heat in compact, high-luminance waveguides.
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Photolithography & UV curing — pass process light while shielding stages and optics from IR load.
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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? HM-745 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
