Long wave pass (LWP) infrared filters are engineered to efficiently separate adjacent spectral bands within the infrared spectrum, ensuring precise performance for applications requiring specific wavelength discrimination. The cut-on edge of these filters can be positioned between 0.85 µm and 11 µm, offering flexibility for a variety of technical needs. Umicore offers a wide selection of off-the-shelf IR filter designs, along with a wealth of experience in crafting custom solutions tailored to meet specific performance requirements. Whether for standard use or specialized applications, our filters provide high precision, durability, and reliability.

Infrared filter spectral specifications

  • Transmission Peak: Typically ≥85%
  • Transmission Average: Typically ≥70%
  • Attenuation: Typically ≤0.1% outside passband
  • Edge Slopes: Typically 3% to 5%
  • Surface Quality: Typically 60:40 Scratch:Dig
  • Operating Temperature: Typically -40°C to +80°C

Infrared filter environmental durability testing

  • Adhesion: MIL-C-48497A (4.5.3.1)
  • Humidity: MIL-C-48497A (4.5.3.2)
  • Moderate Abrasion: MIL-C-48497A (4.5.3.3)
  • Temperature: MIL-C-48497A (4.5.4.1)
  • Solubility/Cleanability: MIL-C-48497A (4.5.4.2)
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