Dichroic coatings IR pass filters

Trim filters, also commonly known as cut-off or dichroic filters, are advantageous for a variety of applications. Common uses include optical noise reduction for bar-code readers and wavelength band isolation for fluorescence applications. Trim filters are often used in conjunction with absorptive filter glasses to form band pass filters.

Our Covert, Semi-Covert, and Blackeye filters are ideally suited for use in conjunction with infra-red cameras, scopes and goggles for surveillance and other nighttime applications. These filters enable light sources and imaging devices to emit and receive infrared energy without drawing attention with the
visible light which would otherwise be seen.

These filters are often kept on the shelf on 24 inch diameter substrates and can be cut down to size per your specifications. We will be happy to be of service in meeting your IR filter needs.

Long Wave Pass Trim Filter
Long wave pass cutoff filter provides average reflectance more than 99% from 400-700 nm, 50% cutoff point at 750nm+/- 10 nm and 95% transmission from 780-1200 nm. Custom long wave pass filters are available on request.

We have several designs for different applications:

Semi-Covert:

This filter is made of specially coated optical glass
designed to reduce the visible output of a light source while allowing infrared output to pass through. Transmission is <= 1.0% average at 400 to 720 nm and >= 70% average from 850 to 2500 nm. It is designed for use with night vision equipment or CCD cameras for applications such as amusement park surveillance, airport perimeter security, and building security.

Covert:

This specially coated optical glass filter blocks the
visible output from a light source and allows infrared
output to pass through. Transmission is <= 1.0%
average from 400 to 815 nm and >= 70% average
from 900 to 1200 nm. It is designed for use with night
vision equipment of CCD cameras for applications
such as airport security, law enforcement
surveillance, and building security.

Blackeye:

This unique filter consists of a two piece optically coated substrate designed to block the visible output of a light source from as close as 3 feet. Transmission is <= 1.0% average from 400 to 890 nm and >= 65% average from 950 to 2500 nm. Reflectance is <= 5.0% average from 400 to 700 nm. It is ideally suited for use with night vision equipment or CCD cameras for short or long range surveillance applications.

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