HM-690 Hot Mirror & UV-IR Cut Filter
HM-690 is a visible-pass, IR-trimming hot mirror: it holds ~92–95 % T from ~420–680 nm, makes a sharp cut near ~690–710 nm, and drives the first NIR into a deep trough (~1–3 % T at ~750–850 nm). Beyond 0.9 µm it shows defined IR windows (~0.92–0.95 µm; ~1.05–1.12 µm up to ~90–95 % T) tapering toward ~1.20 µm (~40–60 % T). UV <~390 nm is strongly attenuated.
- VIS window: ~92–95 % T, ~420–680 nm (high, flat)
- Long-wave edge: ~690–710 nm 10→90 % transition; deep trough ~1–3 % T @ ~750–850 nm
- IR windows >0.9 µm: Narrow ~0.92–0.95 µm; lobe ~1.05–1.12 µm (to ~90–95 % T); taper to ~1.20 µm (~40–60 % T)
- UV behaviour: Strong attenuation 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)
Learn more
HM-690 keeps visible luminance and colour fidelity while trimming near-edge IR that causes haze and heat. The defined windows beyond 0.9 µm are useful for sensing/monitoring paths; if ultra-low NIR is required, pair with a secondary SWIR blocker.
Typical applications • Digital & film cameras (neutral white with trimmed NIR) • Projectors & UHP engines (reflect heat-carrying IR) • Machine vision & human-viewing optics (true-colour to Si sensors) • AR/HUD combiners (bright imagery, managed thermal load) • Microscopy & biomedical lighting (cool, shadow-free white).
Need test chips tomorrow or thousands next quarter? HM-690 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
HM-690 is a visible-pass, IR-trimming hot mirror. It holds ~92–95% T across ~420–680 nm, then makes a steep long-wave cut near ~690–710 nm. Through the first NIR region the curve forms a deep trough (typically ~1–3% T from ~750–850 nm). Beyond ~0.9 μm the coating shows defined IR windows: a narrow pass around ~0.92–0.95 μm, a broader lobe near ~1.05–1.12 μm that can approach ~90–95% T, and a taper toward ~1.20 μm (~40–60% T). UV below ~390 nm is strongly attenuated.
Key advantages
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High, flat VIS window — ~92–95% T from ~420–680 nm preserves colour fidelity and luminance.
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Sharp 690 nm edge — fast 10-to-90% transition cleanly separates visible and the first NIR band.
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IR trough to ~0.85 μm — low single-digit %T (~1–3% typical) minimises near-edge haze and heat.
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Defined IR windows beyond 0.9 μm — narrow pass near ~0.93 μm and a second lobe around ~1.05–1.12 μm; plan secondary blocking if very low NIR is required.
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UV moderation — strong suppression below ~390 nm helps reduce fluorescence and sensor noise.
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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 — trim NIR contamination while keeping white balance neutral.
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Laser & UHP projectors — reflect heat-carrying IR away from phosphor wheels and LCD engines.
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Machine vision & human-viewing optics — pass true-colour images to Si sensors while reducing near-edge IR.
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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-690 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
