HM-730 Hot Mirror & UV-IR Cut Filter

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. Visible transmission spans blue (92.6 %), green (93.5 %), yellow (93.9 %), and red (94.4 %), all exceeding 92 % for neutral color balance. The distinctive characteristic is a gradual NIR rolloff rather than a sharp cutoff: NIR(700-850) transmission reaches 28.6 %, NIR(850-1000) is 13.1 %, and SWIR(1000-1200) reaches 21.5 %. This smooth transition curve and partial IR transmission make HM-730 suitable for applications where some thermal information needs to pass through alongside visible imagery.

Key Advantages

• Extended visible pass with UV - Passes visible light to 729 nm and permits 19.6 % UV transmission, enabling simultaneous UV and visible imaging or UV-coupled visible monitoring without additional filtering.
• Smooth NIR transition curve - Gradual rolloff (28.6 % at 700-850 nm, 13.1 % at 850-1000 nm, 21.5 % SWIR) provides predictable behavior in spectrally distributed light systems, avoiding sharp edge artifacts.
• Hard-oxide ion-assisted coating - Durable, thermally and mechanically stable coating maintains performance through thermal cycling, temperature extremes, and high-intensity light exposure.
• Neutral visible spectrum - All visible bands (blue 92.6 %, green 93.5 %, yellow 93.9 %, red 94.4 %) exceed 92 %, ensuring color-accurate visible transmission alongside partial NIR pass-through.
• 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.

Typical Applications

• 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.
• Thermal and visible simultaneous monitoring - The controlled NIR transmission allows thermal signatures (21-28 % pass-through) to coexist with bright visible imagery, useful for process monitoring and thermal surveys.
• Architectural and theatrical lighting - The gradual NIR rolloff and visible-spectrum fidelity enable efficient, bright lighting with partial thermal management, suitable for stages and architectural displays where some heat radiation is acceptable.
• Medical and endoscopic imaging - UV and visible pass-through with controlled NIR provide flexible illumination and imaging modalities for diagnostic endoscopy and surgical guidance systems.
• Industrial temperature and vision monitoring - Permits simultaneous visual inspection and IR temperature measurement without dual optical paths, streamlining thermal quality-assurance workflows.

KUPO Optics custom-manufactures HM-730 in your exact specifications-diameter, shape, thickness, and substrate options-with rapid prototyping and production volume capability.