SCHOTT North America

Optical Filter Glass

Colored Glass Filters: Product Information

Optical filter glass stands out due to its selective absorption in the visible wavelength range. The optical color filters appear to be colored if their filter effect lies within the visible light spectrum.

SCHOTT Advanced Optics, one of the leading colored glass filter manufacturers with a product range equaled by no other manufacturer world-wide, can provide any size, shape and quality required by the customer.

In order to develop an assortment of colored glass filters, some with extreme filter properties, in the largest possible spectral area, numerous colorants with different concentrations and many different base glasses have been developed.

Optical Filter Glass: Datasheets

All Collection Datasheets Optical Filter Glass Optical Filter Glass Catalogue Filter calculation program Graphic - Overview Optical Filter Glass Bandpass Filters Longpass Filters

- Multi band filters		Light of several bands of wavelengths can pass through this filter Multi band filter
- Long pass filters		Light of long wavelength can pass through these filters Long pass filter
- Band pass filters		Light of a certain range of wavelengths can pass through these filters Band pass filter: VG, S8022, S8023 Band pass filter: BG18 - BG61 Band pass filter: BG3, BG7, BG25 Band pass UV filter
- Short pass filters		Light of short wavelength can pass through these filters Short pass filter
- Neutral density filters		These filters have a homogeneous attenuation for the visible spectrum Neutral density filter

Our colored glass filters are classified into the following filter groups:

- UG:		Black and blue glasses, UV transmitting
- BG:		Blue, blue-green, and multi-band glasses
- VG:		Green glass
- GG:		Nearly 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)

Colored Glass Filters Benefits

Optimal filter solutions can be offered. All colored glass filter types can be used as substrates for thin film coating to manufacture so-called interference filters. Thus the specific advantages of the individual components (absorption properties of colored glass filter and the reflection properties of interference coatings) can be combined in one optical filter.

Advanced Optics is also the preferred supplier of colored glass filters because of its:

Experience with high demands on surface quality, fitting errors, small thickness 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

Key Applications

Optical glass filters are important components in transmitting and blocking certain specific spectral ranges and are used in widely differing application areas:

Industrial measurement
Regulation
Control technology
Analytical measurement methods in production, research and development
Environmental protection
Medicine
Military

KG filters:

Heat absorption filters / heat protection filters (photocopy machines, slide projectors)
Components in protective glasses
Laser safety (windows for lasers)
Surgery lighting (operating room lamps)
Dental lighting
Periscopes (tanks)

N-WG, GG, OG and RG filters:

Long pass filters
Blocking filters for shorter wavelengths (interference band pass filters)

OG filters:

Airport lighting
Rain sensors (as substrate)
Laser safety

RG filters:

Sensor applications
Infrared lighting technology (object protection)
(Night) surveillance systems
Bar code reader
Airport lighting
Laser safety

UG filters:

UV illumination (molecular, finger print, bank note identification)
UV excitation creating visible luminescence
Fluorescence microscopy (immuno reactions)
Sterilization equipment

BG filters:

Silicon receivers (sensitivity correction)
Video cameras (matching to human eye response)
Airport lighting
Eye sensitivity matching
Laser safety

Colored Glass Filters Materials

Materials typically used in colored glass filters include basic glass types, ionically colored glass filters as well as colloidally colored glass.

Colored Glass Filters Forms of Supply

Optical colored glass filters are manufactured and supplied in different thicknesses (from 1 mm to 400 mm depending on raw glass size). By combining different filters together you can achieve additional filter effects.

The polished and cut filters can be thermally toughened for special applications. In consideration of the variety of possible applications, the range of colored glass filters is not limited to certain standard sizes and thicknesses. Instead, they can be produced to specification, subject to each individual glass type’s maximum allowable dimensions and thickness.

Polished optical filters: Filters are supplied in the form of edge-machined, polished plates or discs. The standard polish quality corresponds to a polished surface (P2 according to ISO 10110 Part 8). Higher polish quality is readily available upon request.

Standard format polished colored glass filters, edge-machined with dimension of 50 mm x 50 mm (standard size in the US: 50.8 mm x 50.8 mm) ± 0.2 mm with thickness 1 ± 0.1 mm; 2 ± 0.2 mm and 3 ± 0.2 mm can be supplied upon short notice. The described standard formats can be supplied on short notice.

Cut colored glass filters: With machined edges: Rectangular plates and round discs with ground surfaces and machined edges.

Without machined edges: Rectangular plates with ground surfaces and without machined edges.

Standard formats without machined edges: Plates with dimension of 165 mm x 165 mm +3/–0 mm with the thickness of 3.5 ± 0.5 mm and 4.5 ± 0.5 mm.

Colored Glass Filters Specifications

We can custom make according to customer's specifications, according to ISO 10110 as well as according to MIL specs.

Spectral specifications up to 1 nm accuracy
Spectral range from 250 nm to 3200 nm
Optical density: from 0 to 6
Thickness tolerance: up to 0.001 mm
Polish: P3 or P4

Colored Glass Filters: Calculation Program

The online version of our Glass Filters-Catalog contains all types of glass filters including datasheets made by SCHOTT Advanced Optics.

online catalog

Calculation Program

The calculation program is intended to serve as an additional tool for the glass filter catalog, in order to quickly get an estimation of appropriate solutions for your individual filter problem.

Filter calculation program

Quality Assurance

We carry out self-inspection during the production process, random inspection as well as 100% final inspection, depending on the specifications. Spectral values are measured through a spectrophotometer while fitting error measurement is completed with an interferometry.

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SCHOTT North America, Inc.

400 York Avenue
Duryea, 18642
USA

570-457-7485

570-457-7330

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