High-pass optical filter

Long wavepass filters are designed to achieve efficient separation of adjacent spectral bands. The cut-on edge of the filter may be located between 0.85 and 11 microns Spectral - additional Transmission >90% at wavelengths longer than the cut-on edge. Extent of transmission region is typically in the ratio of 2:1 Attenuation <0.1% at wavelengths shorter than the cut-on edge. Edge Slopes 3%-5% typically Environmental Properties Adhesion MIL-C-48497A, 08/09/1980, para 4.5.3.1 Adhesion Remark Tape test Humidity MIL-C-48497A, 08/09/1980, para 4.5.3.2 Humidity Remark 24hrs, 48°, 95% relative humidity Abrasion MIL-C-48497A, 08/09/1980, para 4.5.3.3 Abrasion Remark Moderate, 50 strokes with a cheesecloth