Optical Filters – Filter Coatings and Optical Glass Filters
Filter optics for every task
Optical filters are crucial for many applications. Their primary purpose is to control the light spectrum in optical systems. Depending on their design, optical filters transmit, reflect, or absorb certain spectra. Absorbing filters, such as filter glasses, attenuate the light intensity in a defined spectral range by energy absorption. Filter coatings, on the other hand, commonly used in laser or imaging applications, selectively reflect or transmit wavelengths, which is mostly achieved by interference, which enables the separation of wavelength ranges by reflection or transmission. The absorption of such filter coatings is typically minimal.
Please find below the continuously available filter optics from our extensive manufacturing program. Please follow the links to the spec sheets with technical details and specifications:
Optical Filter Glasses from SCHOTT
We stock the raw materials of over a hundred high-quality color filter glasses from SCHOTT to ensure rapid manufacturing and delivery of polished filter optics. The SCHOTT filter program includes short pass-, long pass, band pass, neutral density, notch, narrowband, and conversion filters for various wavelengths. Each glass filter material is precisely specified in terms of its transmission properties. These filters are based on absorption.
Further details about the SCHOTT filter materials…
Neutral Density Filters | Grey Filters | Optical Density Filters
SCHOTT's NG neutral density filters are perfect for precisely defined light attenuation. The NG Filter family consists of NG 1, NG 3, NG 4, NG 9, NG 10, NG 11, and NG 12. They are color-neutral and offer a broadband transmission at a defined level and represent an industry standard for neutral-density filters. ND filter sets are available on request.
More details about neutral density filters …
Heat Reflection Filters | Heat Reflecting Hot Mirrors | SIR Series
Our SIR dielectric heat-reflection filters are based on a dichroic coating, which is highly transparent to visible light and effectively blocks the infrared up to around 1100 nm. This type of coated optical short-pass filter is also often called a hot mirror. The SIR also often works as a mirror for eye-tracking applications, as it can reflect an infrared laser beam while remaining transparent to the eye.
More details about the SIR hot mirror …
Heat-Reflecting Filters with Extended Blocking Range | SIR-IR Series
SIR-IR filters offer high optical transmission in the visible range and a significantly broader blocking range for infrared wavelengths than most other filters of this type. This dichroic filter represents the best possible compromise between maximum IR-rejection bandwidth and excellent visible transmittance.
Further information about the SIR-IR …
Cold Light Filters | SHD-Series
Our high-performance dichroic SHD cold light filters (also called cold mirrors) efficiently block the visible spectrum by reflecting it at a 45° incidence angle while transmitting infrared light up to 2500 nm at 0° incidence. Its dielectric coating is also capable of separating visible from infrared laser beams. The SHD is frequently used to efficiently remove heat from an optical beam path.
Further details on the SHD …
Heat-Absorbing Filters | SCHOTT KG1-KG5
SCHOTT KG heat-absorbing filters are band pass filters that transmit the visible light while simultaneously absorbing the heat radiation of a light source. Such heat protection filters operate almost independently of the incidence angle and are ideal for many lighting applications. Specifications and mor information about the KG-filters…
Are you looking for optical filters not listed here?
It is not possible to list the many possible filter variants we fabricate for any existing imaging, light- and laser-based application on this website. Please consider using our inquiry page to request a quotation for custom optical filters, cemented filter combinations, fluorescence filters, narrowband filters, and special dichroic or high-performance interference filters for individual wavelength ranges. If you require engineering support or additional information, please do not hesitate to send us your inquiry with your optical filter's requirements.
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Last update: November 11, 2025