Infrared Optical Interference Filters

Narrow Band Pass Filters

Narrow bandpass filters are designed to isolate a narrow region of the infra-red spectrum. This is accomplished using a complex process of constructive and destructive interference.

Narrow band pass filters have bandwidths (measured at half-peak transmittance levels) less than 6% of the center of wavelength value. When ordering, the bandwidth can be expressed as a percentage of the center wavelength, or can be given in microns.

The filters exhibit high peak transmission (typically greater than 60%) combined with high attenuation levels outside the passband (typically less than 0.1%).

Typical Performance

Narrow Band Pass Curve
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Typical Characteristics

Available wavelength range ~1 to 20um
Tolerance on CWL 
To customers requirements, but standard tolerances are typically +/-0.3% for a 1% bandwidth filter to +/-1% for a 6% bandwidth filter
Peak transmittance Typically >60% (depending on wavelength and bandwidth)
Available bandwidths Typically 0.9% to 6%
Blocking (attenuation)  Typically <0.1 % from 0.3 micron to far infrared

IR Filter - Narrow Bandpass (NBP)

 

 

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.