Optical filter glass is known for its selective absorption in the visible wavelength range. The optical filter glasses appear to be colored if their filter effect lies within the visible light spectrum.
Numerous colorants with different concentrations and many different base glasses have been developed to facilitate the development of an assortment of filters, some with extreme filter properties, in the largest possible spectral region. SCHOTT’s optical filter glasses include the following filter types in the wavelength range above 200 nm:
Bandpass filters - Light of a certain range of wavelengths can pass through these filters
Longpass filters - Light of long wavelength can pass through these filters
Shortpass filters - Light of short wavelength can pass through these filters
Neutral density filters - These filters have almost constant attenuation inside the visible spectrum
Contrast enhancement filters - Specially developed filters for display applications that deliver greater clarity (green displays) and true color rendition in full color displays
Multiband filter - Light of several bands of wavelengths can pass through this filter
All relevant optical filter glass datasheets can be found in the Downloads area.
The online version of our Glass Filters - Catalogue, which contains all types of colored optical glass filters, including datasheets, can be found in the Knowledge Center.
The filter calculation program is intended to serve as an additional tool for the Glass Filters - Catalogue. It will allow you to obtain a quick assessment of the appropriate solutions to your individual filter problem. Please refer to the Knowledge Center.
Interactive filter graphic:
Our colored glass filters have been assigned to the following filter groups:
UG: Black and blue glasses, UV transmitting
BG: Blue, blue-green, and multi-band glasses
VG: Green glass
GG: Virtually colorless to yellow glasses, IR transmitting
OG: Orange glasses, IR transmitting
RG: Red and black glasses, IR transmitting
NG: Neutral density glasses with uniform attenuation in the visible range
N-WG: Colorless glasses with different cutoffs in the UV, transmitting in the visible range and the IR
KG: Virtually colorless glasses with high transmission in the visible and effective absorption in the IR (heat protection filters)
Filter curve hardly depends on the light angle
Superior quality, reliability and durability
No polarization effects
Experience with high demands on surface quality, fitting errors, extremely thin and small thickness tolerances when manufacturing complex types of glass
In-house optical and protection coating capabilities
Ability to accommodate special requirements via close collaboration and development efforts between our customers and our application engineering team
All colored glass filter types can be used as substrates for thin-film coating to manufacture interference filters, thus specific advantages (absorption properties of a colored glass filter and the reflection properties of interference coatings) can be combined in one optical filter