Optical Filters

Filter solutions for every task

Filter optics are crucial for many optical systems. Their primary purpose is to control the spectrum of a light source. 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 filter coatings is typically minimal.

Please find below the continuously available filter optics from our extensive manufacturing program. Please follow the links to the data sheets with details and technical specifications:

 

 

SCHOTT color glass filters

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 shortpass, longpass, bandpass, neutral density, notch, narrowband, and conversion filters for various wavelengths. The technical-grade colored glass filter materials are based on absorption. More details…

 

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. The filters are predominantly color-neutral and offer a broadband transmission at a defined level and represent an industry standard for neutral-density filters. Filter sets are available on request. More details…

 

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 range up to around 1100 nm. This type of optical short-pass filter is also often called a hot mirror. The SIR also worked as a mirror for eye-tracking applications in many customers's applications, as it can reflect an infrared laser beam while remaining transparent to the eye. More details…

 

Heat-Reflecting Filters with Extended Blocking Range | SIR-IR Series

The SIR-IR filters offer high optical transmission in the visible and a more broadband blocking of the infrared wavelength band than most other filters of that kind. This dichroic hot mirror represents the best compromise between maximum IR-rejection bandwidth and excellent visible transmittance.
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Cold Light Filters | SHD-Series

Our high-performance dichroic SHD cold light filters (also called cold mirrors) efficiently reflect the visible spectrum at an incidence angle of 45° while transmitting infrared light up to 2500 nm at 0° incidence. Its dielectric coating is capable of separating visible from infrared laser beams. The SHD is frequently used to efficiently remove heat from an optical beam path.
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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 lighting applications. Show details…

 

Are you looking for optical filters not listed here?

It is not possible to list the many possible filter variants we make 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: September 23, 2025