A dichroic filter, thin-film filter, or interference filter is a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors. Dichroic filters can filter light from a white light source to produce light that is perceived by humans to be highly saturated (intense) in color.
There are substrates which are coated with thin-films to acquire the desired transmission and reflection characteristics across the spectrum. They are often used as color filters (both subtractive and additive). They are slightly sensitive to angles but are much more forgiving than interference filters.
Specifications
Material: | H-K9L, fused silica |
Diameter: | +0/-0.2mm |
Thickness: | +/-0.1mm |
Clear aperture: | > 90% of diameter |
Parallelism: | < 1 arc minute |
Surface quality: | 60-40 scratch and dig |
Transmitted wavefront, P-V | λ/4 @632.8nm |
Edge: | Ground |
Wavelength (nm): | upon request |
Angle of incidence: | 0 degree |
Transmission: | T ave > 90% |
Reflection: | R ave > 98% |
A dichroic filter, thin-film filter, or interference filter is a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors. Dichroic filters can filter light from a white light source to produce light that is perceived by humans to be highly saturated (intense) in color.
There are substrates which are coated with thin-films to acquire the desired transmission and reflection characteristics across the spectrum. They are often used as color filters (both subtractive and additive). They are slightly sensitive to angles but are much more forgiving than interference filters.
Specifications
Material: | H-K9L, fused silica |
Diameter: | +0/-0.2mm |
Thickness: | +/-0.1mm |
Clear aperture: | > 90% of diameter |
Parallelism: | < 1 arc minute |
Surface quality: | 60-40 scratch and dig |
Transmitted wavefront, P-V | λ/4 @632.8nm |
Edge: | Ground |
Wavelength (nm): | upon request |
Angle of incidence: | 0 degree |
Transmission: | T ave > 90% |
Reflection: | R ave > 98% |
