HM-730 Hot Mirror & UV-IR Cut Filter
HM-730 is a visible-pass, IR-trimming hot mirror: ~92–95 % T from ~420–700 nm (low ripple), a fast cut near ~730 nm, ~10–15 % T across ~780–1100 nm, then a rise toward short-SWIR (~75 % T by ~1.2 µm). UV <~380 nm is strongly suppressed.
- VIS window: ~92–95 % T, ~420–700 nm (high, flat, low ripple)
- IR edge: Fast long-wave transition near ~730 nm (clean separation)
- IR attenuation: ~10–15 % T across ~780–1100 nm; rises to ~75 % @ ~1.2 µm
- UV behaviour: Strong short-wave suppression below ~380 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-730 preserves visible colour and luminance while trimming near-edge IR that drives haze and heat. Use as a primary VIS pass with moderated NIR; add a secondary blocker if deeper IR rejection is required (e.g., for SWIR-sensitive setups).
Typical applications • Digital & film cameras (neutral white with trimmed NIR) • Projectors & light engines (divert heat-carrying IR) • 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? HM-730 hot-mirrors are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
HM-730 is a visible-pass, IR-trimming hot mirror. It holds a high, flat passband at ~92–95% transmittance from ~420–700 nm with low ripple, then makes a fast long-wave cut near ~730 nm. In the near-IR the curve settles to ~10–15% T across roughly 780–1100 nm, before rising toward the short-SWIR (~75% T by ~1.2 μm). UV below ~380 nm is strongly suppressed.
Key advantages
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High, flat VIS window — ~92–95% T from ~420–700 nm preserves colour fidelity and luminance.
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Fast ~730 nm edge — clean separation between the visible and the first NIR band.
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Controlled IR attenuation — ~10–15% T across ~780–1100 nm; plan secondary blocking if deeper IR rejection is required.
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UV moderation — steep short-wave cutoff (<~380 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 — trim NIR contamination while keeping white balance neutral.
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Projectors & light engines — divert 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 reducing 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-730 hot-mirror filters are coated and cut-to-size (including dicing) to your exact spec—fast.
FAQ
HM-730 FAQ
What is HM-730 and what is it used for?
HM-730 is a Extended Visible Pass with Gradual NIR Rolloff. The HM-730 passes visible light to 729 nm (50 % crossover) with peak transmission of 95.1 % at 661 nm. Notably, it permits significant UV pass-through (19.6 %), unusual for a hot mirror-a feature enabling UV-sensitive applications. Common uses include Dual-spectrum UV-visible-NIR imaging, Thermal and visible simultaneous monitoring, Architectural and theatrical lighting, and Medical and endoscopic imaging.
What are the key optical specs of HM-730?
Key published specs for HM-730 include Passband (visible): 393–700 nm, 85.7–95.1 % T; Cut-off (T50): ≈ 729 nm; Edge steepness: Data limited; IR rejection: Data limited; AOI: 0° (normal incidence); custom angles available.
What applications is HM-730 best suited for?
HM-730 is commonly used for Dual-spectrum UV-visible-NIR imaging, Thermal and visible simultaneous monitoring, Architectural and theatrical lighting, and Medical and endoscopic imaging. Dual-spectrum UV-visible-NIR imaging - The simultaneous UV, visible, and partial-NIR pass-through supports multi-wavelength analysis in materials inspection, optical characterization, and research applications.
Can HM-730 be customized for size, substrate, or coating requirements?
KUPO lists the construction for HM-730 as Ion-assisted hard-oxide; 5–450 mm shapes, 0.21–3.8 mm thick. Published custom options include Edge tuning, extended IR blocking range, 45° AOI for beam-steering, rapid prototypes. Full custom format availability - Round, square, free-form blanks from 5 mm to 450 mm diameter, thickness 0.21-3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG substrates.
What should I know about angle of incidence and durability for HM-730?
The published angle of incidence for HM-730 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
