Long Wave Pass Infrared Filters

Long Wave Pass (LWP) Infrared Filters are designed to achieve efficient separation of adjacent spectral bands in the infrared spectrum. The cut-on edge of the filter may be located between 0.85µm and 11µm.

Example of LWP IR Filter Spectral Transmission Graph

Umicore has a wide range of off-the-shelf IR Filter designs, as well as extensive experience in designing and producing to bespoke technical performance requirements.

Contact us to discuss your application and learn how we can best support you.

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)