Infrared Optical Interference Filters

Wide Band Pass Filters

Wide band pass 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%.

When ordering, it is necessary to specify the 5% cut on/cut off transmission points or the 50% cut on/cut off transmission points (the 5% points are measured as absolute values but the 50% points are measured as 50% of peak transmittance).

The filters exhibit high average transmission in the pass band (typically greater than 70%) and very low transmission levels outside the pass band (typically less than 0.1 %).

This type of filter is particularly useful for isolating the 3-5μm or 8-12μm atmospheric windows and finds widespread use in thermal imaging/human body sensor applications.

Typical Performance

Wide Band Pass Curve
Click the image to download the pdf

Typical Characteristics

Available wavelength range ~1 to 20um
Cut on / off tolerance  
To customers requirements, from +/-1%. Standard tolerances are typically +/-4% for a 3-5um or 8-12um wide bandwidth filter.
Average transmittance  Typically >70%
Blocking (attenuation) Typically <0.1 % from 0.3 micron to far infrared.

 

 

ELECTRO OPTICAL COMPONENTS, Inc.

NOC & Wavelength Technology offer a wide variety of interference
infrared filters, distributed  in North America exclusively
by ELECTRO OPTICAL COMPONENTS, Inc.