Mid Infrared Filters: 1.5 – 20 μm
Competitively priced standard and non-standard IR filters for detector applications
Stock IR Filters
Check the Stock IR Filter list for your requirement:
- Narrow Band Pass Stock Filter List | NBP Filter Scans
- Wide Bandpass Stock Filter List | WBP Filter Scans
- AR Coating Stock Filter List | AR Coating Scans
- Long Wave Pass Stock Filter List | LWP Filter Scans
- Shortpass Filters
- Neutral Density Filters
Custom IR filters
When you can’t find a stock IR filter for your requirement.
Filters Cut to Size
When you need your filter cut to a special size, we can help you.
Diamond Like Coating (DLC)
When you need a scratch resistant filter surface.
Metalized Filter Edges
When you need a solder seal of the filter to the package for hermeticity
Gas Filter Cells
They eliminate cross-sensitivity to gasses with similar IR signatures in an NDIR gas detection system
IR Filter Technology
Infrared – IR – filters are normally combinations of thin film deposition interference filters. Out of band blocking can be achieved by the proper choice of substrate, reflectance filter stacks or by adding absorption glass.
The thin film infrared filters are comprised of stacks of thin layers (of different optical materials) in controlled thicknesses. Light is reflected at each film interface and by the correct choice of parameters can be made to interfere with that from other interfaces, constructively for certain wavelengths giving high reflectance, and destructively for others giving high transmittance. Long wave pass, short wave pass and bandpass filters can be designed and manufactured in this way.
|4260nm CWL, 90nm BW Narrow Bandpass Filter||3000-5000 nm Wide Bandpass Filter|
IR Filter Applications
The applications for IR filters are diverse. EOC supplies a broad range of mid infrared filters and coatings for a variety of detector applications including Pyroelectric, Thermopile, Lead Selenide (PbSe), Lead Salt (PbS) and MerCadTeluride (MCT) Detectors:
- Environmental monitoring equipment
- Emission monitoring for power plants and factories
- Flame detection for petrochemical plants and oil rigs
- Home and industrial security
- Automotive exhaust analysis
- Spectroscopy equipment
- Ozone layer monitoring equipment
- Blood analyzer equipment (breathalyzers)
- IR cameras
- Aircraft avionics
- Missile and space applications
To determine your infrared filter requirement consider the kind and intensity of the source, detector characteristics, and optical path geometry. EOC will assist you in selecting a suitable standard IR filter or in developing the specification for a custom-made infrared filter.
Mid IR Filter and Coating Types
Narrow Bandpass Filters (NBP) | NBP Filter Scans
Narrow bandpass IR filters are designed to isolate a narrow region of the infrared spectrum. This is accomplished using a complex process of constructive and destructive interference.
Wide Bandpass Filters (WBP) | WBP Filter Scans
Wide bandpass filters are designed to isolate a very wide spectral band. They are classified by having bandwidths (measured at half peak transmittance levels) greater than 13%.
Long Wave Pass Filters (LWP) | LWP Filter Scans
Long Wave Pass filters (also referred to as edge filters) are constructed from stacks of thin layers. They are distinguished by a sharp transition from a zone of rejection to a zone of transmission.
Short Wave Pass Filters (SWP)
Short wave pass filters are distinguished by a sharp transition from a zone of transmission to a zone of rejection.
Neutral Density Filters
The majority of neutral density filters offered are manufactured with a metallic coating which attenuates incident light by both reflection and absorption.
AR (Anti-Reflection) Coatings | AR Coating Scans
Capabilities in anti-reflection coatings range from single layers to advanced high efficiency multi-layer coatings. These coatings can be applied to windows, lenses or customer supplied substrates.
TO Caps with IR Filters
Infrared Filter Assembly with TO Cap
Electro Optical Components can supply filters or lenses mounted into metal caps vacuum proof by gluing. This will reduce efforts on the side of OEM customers and reduce the overall cost of the final products. With sophisticated gluing technology, the caps will have a rate of leakage less than 5×10-9 Pa*l/s. All specifications can be customized to customer requirements. The IR filter specifications can also be customer specific.
IR Filter Technical Notes: