CTO-060 Color Temperature Orange (Warming) Filter

CTO-060 features a distinctively narrow bandpass profile with its 50 % crossover at 571 nm and a focused peak of 88.8 % at 598 nm. The filter holds T > 85 % only from 589-670 nm, creating a concentrated orange-band window. Below the passband, blue is deeply suppressed (avg 7.4 %) and green averages 15.3 %. Above the passband, NIR rolls off significantly to 64.9 % at 700-800 nm and 77 % at 800 nm. This bandpass-like character concentrates output tightly in the orange-red band.

Key Advantages

• Narrow orange-band passband (T > 85 % from 589-670 nm) - concentrates output in a focused orange-red window for saturated warm colour.
• Peak of 88.8 % at 598 nm - centres maximum output at the sodium-D line wavelength for a pure orange tone.
• Strong blue-green suppression (blue avg 7.4 %) - delivers deep cool-tone rejection for high colour purity.
• Hard-oxide durability - ion-assisted coating resists heat, humidity, solvents, and cleaning.
• Custom formats available - round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates.

Typical Applications

• Stage and theatrical lighting - produces a tightly focused orange wash for flame effects, sodium-lamp simulation, and warm accent lighting.
• Film and photography orange effects - creates a concentrated orange tone for stylised visual effects and warm-scene atmospherics.
• Sodium-line simulation - the peak at 598 nm closely matches sodium-D emission, enabling realistic sodium-lamp recreation from broadband sources.
• Machine vision orange-band isolation - selects the narrow 590-670 nm band for fruit sorting, chemical detection, and colour inspection tasks.
• Spectral research and teaching - provides a well-defined orange passband for optical demonstrations and spectral-analysis studies.

Need prototypes in days or production volumes next quarter? CTO-060 filters can be coated, diced, and shipped to your exact specifications.